Ubuntu下无法识别u盘？

[shawnrong]

在ibm t40上装的ubuntu 7.04，已经在新立得中升级到最新。
插入u盘后，系统没任何反应，用
#lsusb
也看不到任何设备信息:
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000
如果插入usb鼠标倒是可以识别，正常使用:
Bus 004 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 002 Device 002: ID 046d:c00e Logitech, Inc. M-BJ69 Optical Wheel Mouse
Bus 002 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000
之前曾经在一个台式机和一台compaq笔记本上安装过ubuntu，都能正常识别该u盘，也试过
别的u盘，可以确认不是u盘的问题。
用
dmesg查看usb相关的信息：
[ 1885.556000] usb 4-4: new high speed USB device using ehci_hcd and address 114
[ 1887.824000] usb 4-4: new high speed USB device using ehci_hcd and address 122
[ 1888.328000] usb 4-4: new high speed USB device using ehci_hcd and address 123
[ 1893.116000] usb 4-4: new high speed USB device using ehci_hcd and address 15
[ 1897.652000] usb 4-4: new high speed USB device using ehci_hcd and address 32
[ 1899.668000] usb 4-4: new high speed USB device using ehci_hcd and address 39
[ 1900.172000] usb 4-4: new high speed USB device using ehci_hcd and address 40
[ 1904.204000] usb 4-4: new high speed USB device using ehci_hcd and address 55
[ 1907.984000] usb 4-4: new high speed USB device using ehci_hcd and address 69
[ 1909.244000] usb 4-4: new high speed USB device using ehci_hcd and address 73
[ 1915.040000] usb 4-4: new high speed USB device using ehci_hcd and address 95
[ 1917.812000] usb 4-4: new high speed USB device using ehci_hcd and address 105
[ 1918.072000] ehci_hcd 0000:00:1d.7: port 4 reset error -110
[ 1918.072000] hub 4-0:1.0: hub_port_status failed (err = -32)
[ 1927.136000] usb 4-4: new high speed USB device using ehci_hcd and address 13
[ 1927.640000] usb 4-4: new high speed USB device using ehci_hcd and address 14
[ 1935.200000] usb 4-4: new high speed USB device using ehci_hcd and address 43
[ 1935.460000] ehci_hcd 0000:00:1d.7: port 4 reset error -110
[ 1935.460000] hub 4-0:1.0: hub_port_status failed (err = -32)
[ 1937.216000] usb 4-4: new high speed USB device using ehci_hcd and address 48


在google上搜索，好像都没有人遇到这种问题。别人顶多是不能自动mount，可我这里好像
是根本连硬件都没认出来？！

[shawnrong]

问题解决，执行
rmmod ehci_hcd
后就可以识别了，好畸形阿！

[lumi]

估计是ehci（usb 2.0的host）驱动的兼容性问题。

rmmod ehci_hcd是卸载掉ehci的驱动，这样，你的u盘虽然能够访问，实际是按照usb 1.1的方式访问的。速度会慢很多。

[letcase]

我也碰到这个问题了，按2楼方法解决了。可是我以前是可以用的，最后一次好像提示有错误，当时没有仔细看，后来就不行了。

[dsdsdds]

强烈赞！

[cnking.org]

Ubuntu无法识别USB记忆棒的解决办法:http://www.cnking.org/post/355.html

[iorikyox]

谢谢ls的回复，我的读卡器在ubuntu9.10下不能读sd卡，试试看