原来一直用的一个wifi，用的好好的，但就在前两天突然就检测不到了，但是实际wifi还是有的（我还有一台window的笔记本连的好好的，随便打开手机也能正常连接上网），无线网卡也是开着的，列表里有几个别的wifi信号，但是原来常用的那个却没有，真是邪门了！wifi的名字与密码都没改过，window系统的那个本一直正常使用。

用 iwlist scan 扫描一下试试。设SSID为TPLINK_BA1404

出现了
irda0 Interface doesn't support scanning.

lo Interface doesn't support scanning.

eth0 Interface doesn't support scanning.

wifi里选择网络里有其它的wifi信号，但就是没有前阵子用的那一个，奇怪。

把下面指令 複製 貼進終端機 執行
0. uname -r
1. sudo lspci -knn
1-1. 如果無線網卡是 usb 裝置 請增加
sudo lsusb
2. sudo lshw -numeric -class network
3. sudo ifconfig -a
4. sudo route -nv
5. sudo rfkill list all
把結果直接 選取/複製 貼上來

使用的不是usb的无线网卡。敲入您给的命令后，出现：
第一个：0. uname -r
3.16.0-4-686-pae
第二个：1. sudo lspci -knn
00:00.0 Host bridge [0600]: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub [8086:27a0] (rev 03)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:2017]
Kernel driver in use: agpgart-intel
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller [8086:27a2] (rev 03)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:201a]
Kernel driver in use: i915
00:02.1 Display controller [0380]: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller [8086:27a6] (rev 03)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:201a]
00:1b.0 Audio device [0403]: Intel Corporation NM10/ICH7 Family High Definition Audio Controller [8086:27d8] (rev 02)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:2010]
Kernel driver in use: snd_hda_intel
00:1c.0 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 1 [8086:27d0] (rev 02)
Kernel driver in use: pcieport
00:1c.1 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 2 [8086:27d2] (rev 02)
Kernel driver in use: pcieport
00:1c.2 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 3 [8086:27d4] (rev 02)
Kernel driver in use: pcieport
00:1c.3 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 4 [8086:27d6] (rev 02)
Kernel driver in use: pcieport
00:1d.0 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 [8086:27c8] (rev 02)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:200a]
Kernel driver in use: uhci_hcd
00:1d.1 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 [8086:27c9] (rev 02)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:200a]
Kernel driver in use: uhci_hcd
00:1d.2 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 [8086:27ca] (rev 02)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:200a]
Kernel driver in use: uhci_hcd
00:1d.3 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 [8086:27cb] (rev 02)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:200a]
Kernel driver in use: uhci_hcd
00:1d.7 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller [8086:27cc] (rev 02)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:200b]
Kernel driver in use: ehci-pci
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev e2)
00:1f.0 ISA bridge [0601]: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge [8086:27b9] (rev 02)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:2009]
Kernel driver in use: lpc_ich
00:1f.2 IDE interface [0101]: Intel Corporation 82801GBM/GHM (ICH7-M Family) SATA Controller [IDE mode] [8086:27c4] (rev 02)
Subsystem: Lenovo ThinkPad T60 [17aa:200e]
Kernel driver in use: ata_piix
00:1f.3 SMBus [0c05]: Intel Corporation NM10/ICH7 Family SMBus Controller [8086:27da] (rev 02)
Subsystem: Lenovo ThinkPad R60/T60/X60 series [17aa:200f]
Kernel driver in use: i801_smbus
02:00.0 Ethernet controller [0200]: Intel Corporation 82573L Gigabit Ethernet Controller [8086:109a]
Subsystem: Lenovo ThinkPad X60/X60s [17aa:207e]
Kernel driver in use: e1000e
03:00.0 Network controller [0280]: Intel Corporation PRO/Wireless 3945ABG [Golan] Network Connection [8086:4227] (rev 02)
Subsystem: Intel Corporation Device [8086:1010]
Kernel driver in use: iwl3945
15:00.0 CardBus bridge [0607]: Ricoh Co Ltd RL5c476 II [1180:0476] (rev b4)
Subsystem: Lenovo ThinkPad X60/X60s [17aa:201c]
Kernel driver in use: yenta_cardbus
15:00.1 FireWire (IEEE 1394) [0c00]: Ricoh Co Ltd R5C552 IEEE 1394 Controller [1180:0552] (rev 09)
Subsystem: Lenovo ThinkPad X60/X60s [17aa:201e]
Kernel driver in use: firewire_ohci
15:00.2 SD Host controller [0805]: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter [1180:0822] (rev 18)
Subsystem: Lenovo ThinkPad X60/X60s [17aa:201d]
Kernel driver in use: sdhci-pci

1. 多试几次 iwlist scan，有时NetworkManager正在扫描，占用了无线网卡，iwlist会短时间不能使用

2. 试试 nmcli dev wifi 能否列出

3. 手机做一个新热点，看能否搜到并连接上网

4. 您看错了4楼的信息，'如果無線網卡是 usb 裝置 請增加' 属于层级 1-1，仅有 'lsusb' 一个分支。
再把

结果发上来。

1. https://wireless.wiki.kernel.org/en/use ... s/iwlegacy
Supported Devices
Intel PRO/Wireless 3945ABG (2.6.24)
Firmware 2.6.24+ ~ 2.6.29+

2. 沒看到支援 3.16 的 驅動及韌體
2-1. 如果你還想試試
https://wireless.wiki.kernel.org/_media ... 32.2.9.tgz
下載 iwlwifi-3945-ucode-15.32.2.9.tgz 來試試
但是 有沒有效 要試試才知道

列出了几个，但是没有想要的那个。

个别命令没有，lshw -C network，rfkill list all。
eth0 Link encap:Ethernet HWaddr 00:16:d3:bb:1e:cf
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
Interrupt:16 Memory:ee000000-ee020000

irda0 Link encap:IrLAP HWaddr 00:00:00:00
NOARP MTU:2048 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:8
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:28 errors:0 dropped:0 overruns:0 frame:0
TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:1680 (1.6 KiB) TX bytes:1680 (1.6 KiB)

wlan0 Link encap:Ethernet HWaddr 00:1b:77:7d:08:16
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)


wlan0 IEEE 802.11abg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=15 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off

irda0 no wireless extensions.

lo no wireless extensions.

eth0 no wireless extensions.

Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface

怎样把这个网卡的驱动卸掉然后重装一下啊

重装了下系统，发现还是搜索不到，重启了下路由器那边，发现行了，害的我白折腾了。

晕..