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安装的是Ubuntu 14.04桌面版，执行命令sudo modprobe -r iwlwifi mac80211，将iwlwifi 和mac80211两个模块从内核移除后，在执行sudo modprobe iwlwifi mac80211将这两个模块加载回来后，用命令lsmod查看内核已加载模块，有iwlwifi mac80211两个模块。但连接不上网络。但是重启电脑后可以连接无线网络。有大神帮忙知道吗？

1. 打开两个终端；
2. 在第一个终端中执行 sudo tail -f /var/log/syslog
3. 在第二个终端中“执行命令sudo modprobe -r iwlwifi mac80211 将iwlwifi 和mac80211两个模块从内核移除后，再执行sudo modprobe iwlwifi mac80211将这两个模块加载回来”；
4. 尝试连接无线网；
5. 将第一个终端中刷出的信息全部复制贴上来，不要节选或截图，以免遗漏信息。（可事先将终端的 scrollback 设大一些）

chensiwen@chensiwen:~$ sudo tail -f /var/log/syslog
[sudo] password for chensiwen:
Jul 12 21:18:19 chensiwen kernel: [ 6656.327733] iwlwifi 0000:04:00.0: rssis: 37 0 0 noise: -82 agc: 52 antenna_sel: 24 fake_rate_n_flags=0x906
Jul 12 21:18:50 chensiwen kernel: [ 6687.264747] iwlwifi 0000:04:00.0: rssis: 37 0 0 noise: -81 agc: 49 antenna_sel: 24 fake_rate_n_flags=0x906
Jul 12 21:18:50 chensiwen kernel: [ 6687.290812] iwlwifi 0000:04:00.0: rssis: 38 0 0 noise: -81 agc: 49 antenna_sel: 24 fake_rate_n_flags=0x906
Jul 12 21:18:50 chensiwen kernel: [ 6687.513884] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -87 agc: 44 antenna_sel: 24 fake_rate_n_flags=0x906
Jul 12 21:18:50 chensiwen kernel: [ 6687.532219] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -77 agc: 48 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:18:56 chensiwen kernel: [ 6693.529328] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -87 agc: 48 antenna_sel: 24 fake_rate_n_flags=0x2907
Jul 12 21:18:56 chensiwen kernel: [ 6693.529677] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -87 agc: 50 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:18:56 chensiwen kernel: [ 6693.529905] iwlwifi 0000:04:00.0: rssis: 38 0 0 noise: -87 agc: 50 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:18:56 chensiwen kernel: [ 6693.531810] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -87 agc: 51 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:18:56 chensiwen kernel: [ 6693.532657] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -87 agc: 51 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:04 chensiwen kernel: [ 6701.884652] iwlwifi 0000:04:00.0: rssis: 40 0 0 noise: -83 agc: 45 antenna_sel: 24 fake_rate_n_flags=0x2907
Jul 12 21:19:05 chensiwen kernel: [ 6702.159910] iwlwifi 0000:04:00.0: rssis: 40 0 0 noise: -74 agc: 45 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:07 chensiwen kernel: [ 6704.233473] wlan0: AP f4:ec:38:1f:e5:3a changed bandwidth, new config is 2452 MHz, width 1 (2452/0 MHz)
Jul 12 21:19:10 chensiwen kernel: [ 6707.147490] iwlwifi 0000:04:00.0: rssis: 38 0 0 noise: -74 agc: 47 antenna_sel: 24 fake_rate_n_flags=0x906
Jul 12 21:19:11 chensiwen kernel: [ 6708.143278] iwlwifi 0000:04:00.0: rssis: 38 0 0 noise: -85 agc: 46 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:11 chensiwen kernel: [ 6708.677918] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -84 agc: 50 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:12 chensiwen kernel: [ 6709.007940] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -85 agc: 50 antenna_sel: 24 fake_rate_n_flags=0x2907
Jul 12 21:19:12 chensiwen kernel: [ 6709.008129] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -85 agc: 50 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:12 chensiwen kernel: [ 6709.257329] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -78 agc: 47 antenna_sel: 24 fake_rate_n_flags=0x2907
Jul 12 21:19:12 chensiwen kernel: [ 6709.257406] iwlwifi 0000:04:00.0: rssis: 38 0 0 noise: -78 agc: 49 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:16 chensiwen kernel: [ 6713.713241] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -83 agc: 48 antenna_sel: 24 fake_rate_n_flags=0x2907
Jul 12 21:19:16 chensiwen kernel: [ 6713.713272] iwlwifi 0000:04:00.0: rssis: 38 0 0 noise: -83 agc: 49 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:17 chensiwen kernel: [ 6714.938345] iwlwifi 0000:04:00.0: rssis: 40 0 0 noise: -85 agc: 45 antenna_sel: 24 fake_rate_n_flags=0x2907
Jul 12 21:19:17 chensiwen kernel: [ 6714.938389] iwlwifi 0000:04:00.0: rssis: 38 0 0 noise: -85 agc: 47 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:17 chensiwen kernel: [ 6714.940289] iwlwifi 0000:04:00.0: rssis: 38 0 0 noise: -85 agc: 47 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:17 chensiwen kernel: [ 6714.940734] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -85 agc: 48 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 12 21:19:19 chensiwen kernel: [ 6716.008416] wlan0: AP f4:ec:38:1f:e5:3a changed bandwidth, new config is 2452 MHz, width 2 (2442/0 MHz)
Jul 12 21:19:19 chensiwen kernel: [ 6716.775002] wlan0: deauthenticating from f4:ec:38:1f:e5:3a by local choice (Reason: 3=DEAUTH_LEAVING)
Jul 12 21:18:01 chensiwen wpa_supplicant[1027]: message repeated 12 times: [ wlan0: CTRL-EVENT-SCAN-STARTED ]
Jul 12 21:19:19 chensiwen wpa_supplicant[1027]: wlan0: CTRL-EVENT-DISCONNECTED bssid=f4:ec:38:1f:e5:3a reason=3 locally_generated=1
Jul 12 21:19:19 chensiwen NetworkManager[952]: <warn> Connection disconnected (reason -3)
Jul 12 21:19:19 chensiwen avahi-daemon[744]: Interface wlan0.IPv6 no longer relevant for mDNS.
Jul 12 21:19:19 chensiwen avahi-daemon[744]: Leaving mDNS multicast group on interface wlan0.IPv6 with address fe80::221:6aff:fe30:8cd0.
Jul 12 21:19:19 chensiwen dhclient: receive_packet failed on wlan0: Network is down
Jul 12 21:19:19 chensiwen avahi-daemon[744]: Interface wlan0.IPv4 no longer relevant for mDNS.
Jul 12 21:19:19 chensiwen avahi-daemon[744]: Leaving mDNS multicast group on interface wlan0.IPv4 with address 192.168.1.112.
Jul 12 21:19:19 chensiwen avahi-daemon[744]: Withdrawing address record for fe80::221:6aff:fe30:8cd0 on wlan0.
Jul 12 21:19:19 chensiwen avahi-daemon[744]: Withdrawing address record for 192.168.1.112 on wlan0.
Jul 12 21:19:19 chensiwen avahi-daemon[744]: Withdrawing workstation service for wlan0.
Jul 12 21:19:19 chensiwen whoopsie[1030]: offline
Jul 12 21:19:19 chensiwen NetworkManager[952]: SCPlugin-Ifupdown: devices removed (path: /sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0/net/wlan0, iface: wlan0)
Jul 12 21:19:19 chensiwen NetworkManager[952]: <info> (wlan0): device state change: activated -> unmanaged (reason 'removed') [100 10 36]
Jul 12 21:19:19 chensiwen NetworkManager[952]: <info> (wlan0): deactivating device (reason 'removed') [36]
Jul 12 21:19:19 chensiwen kernel: [ 6716.820210] cfg80211: World regulatory domain updated:
Jul 12 21:19:19 chensiwen kernel: [ 6716.820217] cfg80211: DFS Master region: unset
Jul 12 21:19:19 chensiwen kernel: [ 6716.820219] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
Jul 12 21:19:19 chensiwen kernel: [ 6716.820224] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:19 chensiwen kernel: [ 6716.820229] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:19 chensiwen kernel: [ 6716.820232] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:19 chensiwen kernel: [ 6716.820236] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:19 chensiwen kernel: [ 6716.820240] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:19 chensiwen kernel: [ 6716.859331] iwlwifi 0000:04:00.0: L1 Enabled - LTR Disabled
Jul 12 21:19:19 chensiwen kernel: [ 6716.867435] iwlagn: connector callback deregistered
Jul 12 21:19:20 chensiwen NetworkManager[952]: <info> (wlan0): canceled DHCP transaction, DHCP client pid 2187
Jul 12 21:19:20 chensiwen NetworkManager[952]: <warn> sysctl: failed to open '/proc/sys/net/ipv6/conf/wlan0/accept_ra': (2) 没有那个文件或目录
Jul 12 21:19:20 chensiwen NetworkManager[952]: <warn> sysctl: failed to open '/proc/sys/net/ipv6/conf/wlan0/use_tempaddr': (2) 没有那个文件或目录
Jul 12 21:19:20 chensiwen NetworkManager[952]: <warn> (3) failed to find interface name for index
Jul 12 21:19:20 chensiwen NetworkManager[952]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Jul 12 21:19:20 chensiwen NetworkManager[952]: <error> [1468329560.53510] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Jul 12 21:19:20 chensiwen NetworkManager[952]: <warn> (3) failed to find interface name for index
Jul 12 21:19:20 chensiwen NetworkManager[952]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Jul 12 21:19:20 chensiwen NetworkManager[952]: <error> [1468329560.53816] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Jul 12 21:19:20 chensiwen NetworkManager[952]: <info> (wlan0): bringing up device.
Jul 12 21:19:20 chensiwen NetworkManager[952]: <warn> (3) failed to find interface name for index
Jul 12 21:19:20 chensiwen NetworkManager[952]: nm_system_iface_flush_routes: assertion 'iface != NULL' failed
Jul 12 21:19:20 chensiwen NetworkManager[952]: <warn> (3) failed to find interface name for index
Jul 12 21:19:20 chensiwen NetworkManager[952]: <warn> DNS: plugin dnsmasq update failed
Jul 12 21:19:20 chensiwen NetworkManager[952]: <info> Removing DNS information from /sbin/resolvconf
Jul 12 21:19:20 chensiwen dnsmasq[2190]: setting upstream servers from DBus
Jul 12 21:19:20 chensiwen NetworkManager[952]: <info> (wlan0): cleaning up...
Jul 12 21:19:20 chensiwen NetworkManager[952]: <warn> (3) failed to find interface name for index
Jul 12 21:19:20 chensiwen NetworkManager[952]: (nm-system.c:766):nm_system_iface_get_flags: runtime check failed: (iface != NULL)
Jul 12 21:19:20 chensiwen NetworkManager[952]: <error> [1468329560.99833] [nm-system.c:768] nm_system_iface_get_flags(): (unknown): failed to get interface link object
Jul 12 21:19:20 chensiwen NetworkManager[952]: <info> Unmanaged Device found; state CONNECTED forced. (see http://bugs.launchpad.net/bugs/191889)
Jul 12 21:19:20 chensiwen NetworkManager[952]: <info> radio killswitch /sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0/ieee80211/phy0/rfkill0 disappeared
Jul 12 21:19:20 chensiwen dbus[589]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Jul 12 21:19:20 chensiwen dbus[589]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jul 12 21:19:35 chensiwen kernel: [ 6732.805856] iwlwifi: unknown parameter 'mac80211' ignored
Jul 12 21:19:35 chensiwen kernel: [ 6732.806002] Intel(R) Wireless WiFi driver for Linux
Jul 12 21:19:35 chensiwen kernel: [ 6732.806005] Copyright(c) 2003- 2015 Intel Corporation
Jul 12 21:19:35 chensiwen kernel: [ 6732.806281] iwlwifi 0000:04:00.0: can't disable ASPM; OS doesn't have ASPM control
Jul 12 21:19:35 chensiwen kernel: [ 6732.809976] cfg80211: World regulatory domain updated:
Jul 12 21:19:35 chensiwen kernel: [ 6732.809984] cfg80211: DFS Master region: unset
Jul 12 21:19:35 chensiwen kernel: [ 6732.809987] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
Jul 12 21:19:35 chensiwen kernel: [ 6732.809994] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:35 chensiwen kernel: [ 6732.809999] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:35 chensiwen kernel: [ 6732.810003] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:35 chensiwen kernel: [ 6732.810008] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:35 chensiwen kernel: [ 6732.810012] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 12 21:19:35 chensiwen kernel: [ 6732.835219] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-5000-5.ucode failed with error -2
Jul 12 21:19:35 chensiwen kernel: [ 6732.835296] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-5000-4.ucode failed with error -2
Jul 12 21:19:35 chensiwen kernel: [ 6732.835316] iwlwifi 0000:04:00.0: Direct firmware load for iwlwifi-5000-3.ucode failed with error -2
Jul 12 21:19:35 chensiwen kernel: [ 6732.835659] iwlwifi 0000:04:00.0: loaded firmware version 8.24.2.12 op_mode iwldvm
Jul 12 21:19:35 chensiwen kernel: [ 6732.886160] iwlagn: connector callback registered
Jul 12 21:19:35 chensiwen kernel: [ 6732.886196] iwlwifi 0000:04:00.0: CONFIG_IWLWIFI_DEBUG disabled
Jul 12 21:19:35 chensiwen kernel: [ 6732.886200] iwlwifi 0000:04:00.0: CONFIG_IWLWIFI_DEBUGFS enabled
Jul 12 21:19:35 chensiwen kernel: [ 6732.886202] iwlwifi 0000:04:00.0: CONFIG_IWLWIFI_DEVICE_TRACING enabled
Jul 12 21:19:35 chensiwen kernel: [ 6732.886205] iwlwifi 0000:04:00.0: Detected Intel(R) Ultimate N WiFi Link 5300 AGN, REV=0x24
Jul 12 21:19:35 chensiwen kernel: [ 6732.886375] iwlwifi 0000:04:00.0: L1 Enabled - LTR Disabled
Jul 12 21:19:35 chensiwen kernel: [ 6732.912106] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
Jul 12 21:19:35 chensiwen NetworkManager[952]: <info> rfkill2: found WiFi radio killswitch (at /sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0/ieee80211/phy0/rfkill2) (driver iwlwifi)
Jul 12 21:19:35 chensiwen NetworkManager[952]: SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0/net/wlan0, iface: wlan0)
Jul 12 21:19:35 chensiwen NetworkManager[952]: SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:1c.1/0000:04:00.0/net/wlan0, iface: wlan0): no ifupdown configuration found.
Jul 12 21:19:35 chensiwen NetworkManager[952]: <info> (wlan0): using nl80211 for WiFi device control
Jul 12 21:19:35 chensiwen NetworkManager[952]: <info> (wlan0): driver supports Access Point (AP) mode
Jul 12 21:19:35 chensiwen NetworkManager[952]: <info> (wlan0): new 802.11 WiFi device (driver: 'iwlwifi' ifindex: 4)
Jul 12 21:19:35 chensiwen NetworkManager[952]: <info> (wlan0): exported as /org/freedesktop/NetworkManager/Devices/2
Jul 12 21:19:35 chensiwen NetworkManager[952]: <info> (wlan0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jul 12 21:19:35 chensiwen NetworkManager[952]: <info> (wlan0): bringing up device.
Jul 12 21:19:35 chensiwen kernel: [ 6732.919063] iwlwifi 0000:04:00.0: L1 Enabled - LTR Disabled
Jul 12 21:19:35 chensiwen kernel: [ 6732.922079] iwlwifi 0000:04:00.0: Radio type=0x0-0x2-0x0
Jul 12 21:19:36 chensiwen kernel: [ 6733.059311] iwlwifi 0000:04:00.0: L1 Enabled - LTR Disabled
Jul 12 21:19:36 chensiwen kernel: [ 6733.062315] iwlwifi 0000:04:00.0: Radio type=0x0-0x2-0x0
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> (wlan0): preparing device.
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> (wlan0): deactivating device (reason 'managed') [2]
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> NetworkManager state is now DISCONNECTED
Jul 12 21:19:36 chensiwen kernel: [ 6733.096327] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> (wlan0) supports 5 scan SSIDs
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> (wlan0): supplicant interface state: starting -> ready
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> (wlan0): device state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42]
Jul 12 21:19:36 chensiwen NetworkManager[952]: <warn> Trying to remove a non-existant call id.
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> (wlan0): supplicant interface state: ready -> disconnected
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> (wlan0) supports 5 scan SSIDs
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Auto-activating connection 'TP-LINK_74C2'.
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Activation (wlan0) starting connection 'TP-LINK_74C2'
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> NetworkManager state is now CONNECTING
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Activation (wlan0/wireless): connection 'TP-LINK_74C2' has security, and secrets exist. No new secrets needed.
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Config: added 'ssid' value 'TP-LINK_74C2'
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Config: added 'scan_ssid' value '1'
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Config: added 'key_mgmt' value 'WPA-PSK'
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Config: added 'auth_alg' value 'OPEN'
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Config: added 'psk' value '<omitted>'
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> (wlan0): supplicant interface state: disconnected -> inactive
Jul 12 21:19:46 chensiwen NetworkManager[952]: <info> Config: set interface ap_scan to 1
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> (wlan0): disconnecting for new activation request.
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> (wlan0): device state change: config -> disconnected (reason 'none') [50 30 0]
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> (wlan0): deactivating device (reason 'none') [0]
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> NetworkManager state is now DISCONNECTED
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Activation (wlan0) starting connection '1023_Network'
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> NetworkManager state is now CONNECTING
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> (wlan0): supplicant interface state: inactive -> disconnected
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
Jul 12 21:19:50 chensiwen wpa_supplicant[1027]: wlan0: Reject scan trigger since one is already pending
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Activation (wlan0/wireless): connection '1023_Network' requires no security. No secrets needed.
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Config: added 'ssid' value '1023_Network'
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Config: added 'scan_ssid' value '1'
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Config: added 'key_mgmt' value 'NONE'
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
Jul 12 21:19:50 chensiwen NetworkManager[952]: <info> Config: set interface ap_scan to 1
Jul 12 21:19:56 chensiwen wpa_supplicant[1027]: wlan0: SME: Trying to authenticate with f4:ec:38:1f:e5:3a (SSID='1023_Network' freq=2452 MHz)
Jul 12 21:19:56 chensiwen kernel: [ 6753.145462] wlan0: authenticate with f4:ec:38:1f:e5:3a
Jul 12 21:19:56 chensiwen kernel: [ 6753.151053] wlan0: send auth to f4:ec:38:1f:e5:3a (try 1/3)
Jul 12 21:19:56 chensiwen kernel: [ 6753.152801] wlan0: authenticated
Jul 12 21:19:56 chensiwen NetworkManager[952]: <info> (wlan0): supplicant interface state: disconnected -> authenticating
Jul 12 21:20:01 chensiwen wpa_supplicant[1027]: wlan0: SME: Deauth request to the driver failed
Jul 12 21:20:01 chensiwen wpa_supplicant[1027]: wlan0: SME: Trying to authenticate with f4:ec:38:1f:e5:3a (SSID='1023_Network' freq=2452 MHz)
Jul 12 21:20:01 chensiwen kernel: [ 6758.176883] wlan0: authenticate with f4:ec:38:1f:e5:3a
Jul 12 21:20:01 chensiwen kernel: [ 6758.190470] wlan0: send auth to f4:ec:38:1f:e5:3a (try 1/3)
Jul 12 21:20:01 chensiwen kernel: [ 6758.203222] wlan0: authenticated
Jul 12 21:20:06 chensiwen kernel: [ 6763.191864] wlan0: aborting authentication with f4:ec:38:1f:e5:3a by local choice (Reason: 3=DEAUTH_LEAVING)
Jul 12 21:20:06 chensiwen wpa_supplicant[1027]: wlan0: SME: Trying to authenticate with 8c:a6:df:1f:74:c2 (SSID='TP-LINK_74C2' freq=2412 MHz)
Jul 12 21:20:06 chensiwen kernel: [ 6763.199177] wlan0: authenticate with 8c:a6:df:1f:74:c2
Jul 12 21:20:06 chensiwen kernel: [ 6763.213193] wlan0: send auth to 8c:a6:df:1f:74:c2 (try 1/3)
Jul 12 21:20:06 chensiwen kernel: [ 6763.215612] wlan0: authenticated
Jul 12 21:20:11 chensiwen wpa_supplicant[1027]: wlan0: SME: Deauth request to the driver failed
Jul 12 21:20:11 chensiwen NetworkManager[952]: <info> (wlan0): supplicant interface state: authenticating -> disconnected
Jul 12 21:20:11 chensiwen NetworkManager[952]: <info> (wlan0): supplicant interface state: disconnected -> scanning
Jul 12 21:20:16 chensiwen NetworkManager[952]: <warn> Activation (wlan0/wireless): association took too long, failing activation.
Jul 12 21:20:16 chensiwen NetworkManager[952]: <info> (wlan0): device state change: config -> failed (reason 'SSID not found') [50 120 53]
Jul 12 21:20:16 chensiwen NetworkManager[952]: <info> NetworkManager state is now DISCONNECTED
Jul 12 21:20:16 chensiwen NetworkManager[952]: <warn> Activation (wlan0) failed for connection '1023_Network'
Jul 12 21:20:16 chensiwen NetworkManager[952]: <info> (wlan0): device state change: failed -> disconnected (reason 'none') [120 30 0]
Jul 12 21:20:16 chensiwen NetworkManager[952]: <info> (wlan0): deactivating device (reason 'none') [0]
Jul 12 21:20:16 chensiwen NetworkManager[952]: <info> (wlan0): supplicant interface state: scanning -> disconnected
Jul 12 21:20:16 chensiwen wpa_supplicant[1027]: wlan0: Reject scan trigger since one is already pending
Jul 12 21:20:16 chensiwen NetworkManager[952]: <warn> Couldn't disconnect supplicant interface: This interface is not connected.
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> Auto-activating connection 'TP-LINK_74C2'.
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> Activation (wlan0) starting connection 'TP-LINK_74C2'
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> NetworkManager state is now CONNECTING
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
Jul 12 21:20:19 chensiwen NetworkManager[952]: <info> Activation (wlan0/wireless): connection 'TP-LINK_74C2' has security, and secrets exist. No new secrets needed.

chensiwen 写了： Jul 12 21:19:35 chensiwen NetworkManager[952]: <info> (wlan0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jul 12 21:19:36 chensiwen NetworkManager[952]: <info> (wlan0): deactivating device (reason 'managed') [2]

出现此问题时，重新启动 NetworkManager 试试看
对于 Ubuntu 14.04

多谢大神！已经可以连接到网络了！在执行第一条语句后就可以连接到网络啦。大神你这两句是什么原理啊，能简单讲讲不，哈哈哈！不过现在连接不了带有密码的无线网络，这是为啥？再次感谢～～～

chensiwen 写了：在执行第一条语句后就可以连接到网络啦。哈哈哈！

说明 问题的原委可能与以下链接中描述的问题类似
https://bugs.launchpad.net/ubuntu/+sour ... mments=all

chensiwen 写了：这两句是什么原理啊，能简单讲讲不，哈哈哈

可先阅读上文的链接 具体原因待查

chensiwen 写了：在不过现在连接不了带有密码的无线网络，这是为啥 Haha

难道是 wpa_supplicant 没有自己回来？
再出现“连接不了带有密码的无线网络”情况时，执行 pgrep wpa_supp 看 wpa_supplicant 有无运行，并用2楼的办法收集日志看看
也可再测试一次，不要 killall wpa_supplicant，只 service network-manager restart 试试。即只执行4楼的第二句

这是连接上无密码的无线网后，执行pgrep wpa_supp命令后出现的关于wpa_supplicant的信息。

Jul 14 10:49:06 chensiwen kernel: [ 4440.637853] iwlwifi 0000:04:00.0: rssis: 36 38 0 noise: -77 agc: 49 antenna_sel: 21 fake_rate_n_flags=0x907
Jul 14 10:49:16 chensiwen kernel: [ 4450.759870] iwlwifi 0000:04:00.0: rssis: 40 0 0 noise: -77 agc: 45 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 14 10:49:21 chensiwen kernel: [ 4455.680020] iwlwifi 0000:04:00.0: rssis: 38 39 0 noise: -77 agc: 49 antenna_sel: 24 fake_rate_n_flags=0x906
Jul 14 10:49:04 chensiwen wpa_supplicant[4904]: message repeated 2 times: [ wlan0: CTRL-EVENT-SCAN-STARTED ]
Jul 14 10:49:21 chensiwen wpa_supplicant[4904]: nl80211: send_and_recv->nl_recvmsgs failed: -33
Jul 14 10:49:23 chensiwen kernel: [ 4457.760716] iwlwifi 0000:04:00.0: rssis: 0 39 0 noise: -79 agc: 48 antenna_sel: 21 fake_rate_n_flags=0x2907
Jul 14 10:49:23 chensiwen kernel: [ 4457.760989] iwlwifi 0000:04:00.0: rssis: 37 38 0 noise: -79 agc: 49 antenna_sel: 24 fake_rate_n_flags=0x907
Jul 14 10:49:23 chensiwen kernel: [ 4457.778167] iwlwifi 0000:04:00.0: rssis: 0 39 0 noise: -79 agc: 48 antenna_sel: 21 fake_rate_n_flags=0x907
Jul 14 10:49:24 chensiwen kernel: [ 4458.726724] iwlwifi 0000:04:00.0: rssis: 0 38 0 noise: -87 agc: 49 antenna_sel: 21 fake_rate_n_flags=0x907

chensiwen 写了：这是连接上无密码的无线网后，执行pgrep wpa_supp命令后出现的关于wpa_supplicant的信息。

可能是上文描述不够清楚
pgrep wpa 是检查 wpa_supplicant 是否在运行。没有输出表示没有在运行，返回一个数字表示运行中。

0. 重新启动计算机；
1. 打开两个终端；
2. 在第一个终端中“执行命令sudo modprobe -r iwlwifi mac80211 将iwlwifi 和mac80211两个模块从内核移除后，再执行sudo modprobe iwlwifi mac80211将这两个模块加载回来”；
3. 尝试连接无线网，失败
4. sudo killall wpa_supplicant ; sudo service network-manager restart
5. 在第二个终端中执行 sudo tail -f /var/log/syslog
6. 尝试连接“带有密码的无线网络”，失败
7. 将 5. 中第二个终端中刷出的信息全部复制贴上来，不要节选或截图，以免遗漏信息。（可事先将终端的 scrollback 设大一些）

或重复以上步骤，但在 4. 中不要 killall wpa_supplicant，只 service network-manager restart，看 6. 会不会失败

1. 执行chensiwen@chensiwen:~$ sudo killall wpa_supplicant
chensiwen@chensiwen:~$ pgrep wpa
返回数字：4173

2. 只执行sudo service network-manager restart，连接网络失败。

3. 连接有密码的无线网络'TP-LINK_74C2'时，执行的chensiwen@chensiwen:~$ sudo tail -f /var/log/syslog
[sudo] password for chensiwen:
Jul 15 16:50:58 chensiwen kernel: [ 1333.076659] iwlwifi 0000:04:00.0: rssis: 38 36 0 noise: -86 agc: 49 antenna_sel: 24 fake_rate_n_flags=0x905
Jul 15 16:50:58 chensiwen kernel: [ 1333.076887] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -86 agc: 48 antenna_sel: 24 fake_rate_n_flags=0x905
Jul 15 16:50:58 chensiwen NetworkManager[4324]: <info> (wlan0): IP6 addrconf timed out or failed.
Jul 15 16:50:58 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
Jul 15 16:50:58 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) started...
Jul 15 16:50:58 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Jul 15 16:51:03 chensiwen kernel: [ 1338.012517] iwlwifi 0000:04:00.0: rssis: 40 0 0 noise: -86 agc: 42 antenna_sel: 24 fake_rate_n_flags=0x905
Jul 15 16:51:03 chensiwen kernel: [ 1338.012745] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -86 agc: 45 antenna_sel: 24 fake_rate_n_flags=0x906
Jul 15 16:51:03 chensiwen kernel: [ 1338.012829] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -86 agc: 44 antenna_sel: 24 fake_rate_n_flags=0x905
Jul 15 16:51:03 chensiwen kernel: [ 1338.013171] iwlwifi 0000:04:00.0: rssis: 40 0 0 noise: -86 agc: 45 antenna_sel: 24 fake_rate_n_flags=0x905
Jul 15 16:51:06 chensiwen wpa_supplicant[4173]: nl80211: send_and_recv->nl_recvmsgs failed: -33
Jul 15 16:51:06 chensiwen kernel: [ 1341.636995] wlan0: AP f4:ec:38:1f:e5:3a changed bandwidth, new config is 2452 MHz, width 2 (2442/0 MHz)
Jul 15 16:51:08 chensiwen kernel: [ 1343.019012] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -83 agc: 44 antenna_sel: 24 fake_rate_n_flags=0x905
Jul 15 16:51:08 chensiwen kernel: [ 1343.019191] iwlwifi 0000:04:00.0: rssis: 39 0 0 noise: -83 agc: 48 antenna_sel: 24 fake_rate_n_flags=0x906
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> (wlan0): disconnecting for new activation request.
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> (wlan0): device state change: activated -> disconnected (reason 'none') [100 30 0]
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> (wlan0): deactivating device (reason 'none') [0]
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> (wlan0): canceled DHCP transaction, DHCP client pid 4835
Jul 15 16:51:09 chensiwen kernel: [ 1344.508464] wlan0: deauthenticating from f4:ec:38:1f:e5:3a by local choice (Reason: 3=DEAUTH_LEAVING)
Jul 15 16:51:09 chensiwen wpa_supplicant[4173]: wlan0: CTRL-EVENT-DISCONNECTED bssid=f4:ec:38:1f:e5:3a reason=3 locally_generated=1
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <warn> DNS: plugin dnsmasq update failed
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Removing DNS information from /sbin/resolvconf
Jul 15 16:51:09 chensiwen dnsmasq[4364]: setting upstream servers from DBus
Jul 15 16:51:09 chensiwen avahi-daemon[696]: Withdrawing address record for 192.168.1.112 on wlan0.
Jul 15 16:51:09 chensiwen avahi-daemon[696]: Leaving mDNS multicast group on interface wlan0.IPv4 with address 192.168.1.112.
Jul 15 16:51:09 chensiwen avahi-daemon[696]: Interface wlan0.IPv4 no longer relevant for mDNS.
Jul 15 16:51:09 chensiwen kernel: [ 1344.534224] cfg80211: World regulatory domain updated:
Jul 15 16:51:09 chensiwen kernel: [ 1344.534231] cfg80211: DFS Master region: unset
Jul 15 16:51:09 chensiwen kernel: [ 1344.534234] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
Jul 15 16:51:09 chensiwen kernel: [ 1344.534239] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:09 chensiwen kernel: [ 1344.534243] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:09 chensiwen kernel: [ 1344.534247] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:09 chensiwen kernel: [ 1344.534251] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:09 chensiwen kernel: [ 1344.534255] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> NetworkManager state is now DISCONNECTED
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Activation (wlan0) starting connection 'TP-LINK_74C2'
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> NetworkManager state is now CONNECTING
Jul 15 16:51:09 chensiwen dbus[625]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper)
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled...
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <warn> Connection disconnected (reason -3)
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: completed -> disconnected
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <warn> Connection disconnected (reason -3)
Jul 15 16:51:09 chensiwen wpa_supplicant[4173]: wlan0: CTRL-EVENT-SCAN-STARTED
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started...
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled...
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete.
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting...
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0]
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Activation (wlan0/wireless): connection 'TP-LINK_74C2' has security, and secrets exist. No new secrets needed.
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Config: added 'ssid' value 'TP-LINK_74C2'
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Config: added 'scan_ssid' value '1'
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Config: added 'key_mgmt' value 'WPA-PSK'
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Config: added 'auth_alg' value 'OPEN'
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Config: added 'psk' value '<omitted>'
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete.
Jul 15 16:51:09 chensiwen dbus[625]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Jul 15 16:51:09 chensiwen NetworkManager[4324]: <info> Config: set interface ap_scan to 1
Jul 15 16:51:10 chensiwen ntpdate[4926]: Can't find host ntp.ubuntu.com: Name or service not known (-2)
Jul 15 16:51:10 chensiwen ntpdate[4926]: no servers can be used, exiting
Jul 15 16:51:13 chensiwen wpa_supplicant[4173]: wlan0: SME: Trying to authenticate with 8c:a6:df:1f:74:c2 (SSID='TP-LINK_74C2' freq=2412 MHz)
Jul 15 16:51:13 chensiwen kernel: [ 1347.905282] wlan0: authenticate with 8c:a6:df:1f:74:c2
Jul 15 16:51:13 chensiwen kernel: [ 1347.918954] wlan0: send auth to 8c:a6:df:1f:74:c2 (try 1/3)
Jul 15 16:51:13 chensiwen wpa_supplicant[4173]: wlan0: Trying to associate with 8c:a6:df:1f:74:c2 (SSID='TP-LINK_74C2' freq=2412 MHz)
Jul 15 16:51:13 chensiwen kernel: [ 1347.923613] wlan0: authenticated
Jul 15 16:51:13 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: disconnected -> authenticating
Jul 15 16:51:13 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: authenticating -> associating
Jul 15 16:51:13 chensiwen kernel: [ 1347.926277] wlan0: associate with 8c:a6:df:1f:74:c2 (try 1/3)
Jul 15 16:51:13 chensiwen kernel: [ 1347.930912] wlan0: RX AssocResp from 8c:a6:df:1f:74:c2 (capab=0x431 status=0 aid=9)
Jul 15 16:51:13 chensiwen wpa_supplicant[4173]: wlan0: Associated with 8c:a6:df:1f:74:c2
Jul 15 16:51:13 chensiwen kernel: [ 1347.941143] wlan0: associated
Jul 15 16:51:13 chensiwen kernel: [ 1347.945909] cfg80211: Regulatory domain changed to country: CN
Jul 15 16:51:13 chensiwen kernel: [ 1347.945915] cfg80211: DFS Master region: unset
Jul 15 16:51:13 chensiwen kernel: [ 1347.945917] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
Jul 15 16:51:13 chensiwen kernel: [ 1347.945921] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
Jul 15 16:51:13 chensiwen kernel: [ 1347.945924] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (N/A, 3000 mBm), (N/A)
Jul 15 16:51:13 chensiwen kernel: [ 1347.945927] cfg80211: (57240000 KHz - 59400000 KHz @ 2160000 KHz), (N/A, 2800 mBm), (N/A)
Jul 15 16:51:13 chensiwen kernel: [ 1347.945929] cfg80211: (59400000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4400 mBm), (N/A)
Jul 15 16:51:13 chensiwen kernel: [ 1347.945932] cfg80211: (63720000 KHz - 65880000 KHz @ 2160000 KHz), (N/A, 2800 mBm), (N/A)
Jul 15 16:51:13 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: associating -> associated
Jul 15 16:51:14 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: associated -> 4-way handshake
Jul 15 16:51:14 chensiwen wpa_supplicant[4173]: wlan0: WPA: Key negotiation completed with 8c:a6:df:1f:74:c2 [PTK=CCMP GTK=CCMP]
Jul 15 16:51:14 chensiwen wpa_supplicant[4173]: wlan0: CTRL-EVENT-CONNECTED - Connection to 8c:a6:df:1f:74:c2 completed [id=0 id_str=]
Jul 15 16:51:14 chensiwen wpa_supplicant[4173]: wlan0: SME: Trying to authenticate with 8c:a6:df:1f:74:c2 (SSID='TP-LINK_74C2' freq=2412 MHz)
Jul 15 16:51:14 chensiwen kernel: [ 1348.875474] wlan0: deauthenticating from 8c:a6:df:1f:74:c2 by local choice (Reason: 2=PREV_AUTH_NOT_VALID)
Jul 15 16:51:14 chensiwen kernel: [ 1348.886395] wlan0: authenticate with 8c:a6:df:1f:74:c2
Jul 15 16:51:14 chensiwen wpa_supplicant[4173]: wlan0: CTRL-EVENT-DISCONNECTED bssid=8c:a6:df:1f:74:c2 reason=2 locally_generated=1
Jul 15 16:51:14 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: 4-way handshake -> authenticating
Jul 15 16:51:14 chensiwen NetworkManager[4324]: <warn> Connection disconnected (reason -2)
Jul 15 16:51:14 chensiwen wpa_supplicant[4173]: wlan0: Trying to associate with 8c:a6:df:1f:74:c2 (SSID='TP-LINK_74C2' freq=2412 MHz)
Jul 15 16:51:14 chensiwen kernel: [ 1348.898617] wlan0: send auth to 8c:a6:df:1f:74:c2 (try 1/3)
Jul 15 16:51:14 chensiwen kernel: [ 1348.901021] wlan0: authenticated
Jul 15 16:51:14 chensiwen kernel: [ 1348.902494] wlan0: associate with 8c:a6:df:1f:74:c2 (try 1/3)
Jul 15 16:51:14 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: authenticating -> associating
Jul 15 16:51:14 chensiwen kernel: [ 1348.906078] cfg80211: World regulatory domain updated:
Jul 15 16:51:14 chensiwen kernel: [ 1348.906085] cfg80211: DFS Master region: unset
Jul 15 16:51:14 chensiwen kernel: [ 1348.906088] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
Jul 15 16:51:14 chensiwen kernel: [ 1348.906093] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.906097] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.906101] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.906104] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.906107] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.908128] wlan0: RX AssocResp from 8c:a6:df:1f:74:c2 (capab=0x431 status=0 aid=9)
Jul 15 16:51:14 chensiwen wpa_supplicant[4173]: wlan0: Associated with 8c:a6:df:1f:74:c2
Jul 15 16:51:14 chensiwen kernel: [ 1348.921037] wlan0: associated
Jul 15 16:51:14 chensiwen kernel: [ 1348.924895] cfg80211: Regulatory domain changed to country: CN
Jul 15 16:51:14 chensiwen kernel: [ 1348.924901] cfg80211: DFS Master region: unset
Jul 15 16:51:14 chensiwen kernel: [ 1348.924902] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
Jul 15 16:51:14 chensiwen kernel: [ 1348.924906] cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.924908] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (N/A, 3000 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.924910] cfg80211: (57240000 KHz - 59400000 KHz @ 2160000 KHz), (N/A, 2800 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.924912] cfg80211: (59400000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4400 mBm), (N/A)
Jul 15 16:51:14 chensiwen kernel: [ 1348.924914] cfg80211: (63720000 KHz - 65880000 KHz @ 2160000 KHz), (N/A, 2800 mBm), (N/A)
Jul 15 16:51:14 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: associating -> associated
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: associated -> 4-way handshake
Jul 15 16:51:17 chensiwen wpa_supplicant[4173]: wlan0: WPA: Key negotiation completed with 8c:a6:df:1f:74:c2 [PTK=CCMP GTK=CCMP]
Jul 15 16:51:17 chensiwen wpa_supplicant[4173]: wlan0: CTRL-EVENT-CONNECTED - Connection to 8c:a6:df:1f:74:c2 completed [id=0 id_str=]
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> Activation (wlan0/wireless) Stage 2 of 5 (Device Configure) successful. Connected to wireless network 'TP-LINK_74C2'.
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) scheduled.
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) started...
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> (wlan0): device state change: config -> ip-config (reason 'none') [50 70 0]
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Beginning DHCPv4 transaction (timeout in 45 seconds)
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> dhclient started with pid 4968
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Beginning IP6 addrconf.
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) complete.
Jul 15 16:51:17 chensiwen avahi-daemon[696]: Withdrawing address record for fe80::221:6aff:fe30:8cd0 on wlan0.
Jul 15 16:51:17 chensiwen avahi-daemon[696]: Leaving mDNS multicast group on interface wlan0.IPv6 with address fe80::221:6aff:fe30:8cd0.
Jul 15 16:51:17 chensiwen avahi-daemon[696]: Interface wlan0.IPv6 no longer relevant for mDNS.
Jul 15 16:51:17 chensiwen dhclient: Internet Systems Consortium DHCP Client 4.2.4
Jul 15 16:51:17 chensiwen dhclient: Copyright 2004-2012 Internet Systems Consortium.
Jul 15 16:51:17 chensiwen dhclient: All rights reserved.
Jul 15 16:51:17 chensiwen dhclient: For info, please visit https://www.isc.org/software/dhcp/
Jul 15 16:51:17 chensiwen dhclient:
Jul 15 16:51:17 chensiwen NetworkManager[4324]: <info> (wlan0): DHCPv4 state changed nbi -> preinit
Jul 15 16:51:17 chensiwen dhclient: Listening on LPF/wlan0/00:21:6a:30:8c:d0
Jul 15 16:51:17 chensiwen dhclient: Sending on LPF/wlan0/00:21:6a:30:8c:d0
Jul 15 16:51:17 chensiwen dhclient: Sending on Socket/fallback
Jul 15 16:51:17 chensiwen dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 3 (xid=0x94984a6e)
Jul 15 16:51:18 chensiwen avahi-daemon[696]: Joining mDNS multicast group on interface wlan0.IPv6 with address fe80::221:6aff:fe30:8cd0.
Jul 15 16:51:18 chensiwen avahi-daemon[696]: New relevant interface wlan0.IPv6 for mDNS.
Jul 15 16:51:18 chensiwen avahi-daemon[696]: Registering new address record for fe80::221:6aff:fe30:8cd0 on wlan0.*.
Jul 15 16:51:20 chensiwen dhclient: DHCPDISCOVER on wlan0 to 255.255.255.255 port 67 interval 4 (xid=0x94984a6e)

未能对症确定解决方案
先尝试涉及 iwlwifi 的一般性解决方案 重新启动计算机

或在重新加载 iwlwifi 时，使用 sudo modprobe iwlwifi 11n_disable=1