郁闷了2天的U盘问题,竟然是因为内核模块

真的真的被debian打败了,U盘插到机器上以后,死活就是认不出来,dmesg上面有消息说插上了,但是是下面这样的消息:

Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
usb 4-4: new high speed USB device using ehci_hcd and address 7
ehci_hcd 0000:00:1d.7: port 4 reset error -110
hub 4-0:1.0: hub_port_status failed (err = -32)
usb 4-4: new high speed USB device using ehci_hcd and address 11
usb 4-4: new high speed USB device using ehci_hcd and address 15
usb 4-4: new high speed USB device using ehci_hcd and address 18
usb 4-4: new high speed USB device using ehci_hcd and address 22
usb 4-4: new high speed USB device using ehci_hcd and address 29
usb 4-4: new high speed USB device using ehci_hcd and address 33
usb 4-4: new high speed USB device using ehci_hcd and address 40
ehci_hcd 0000:00:1d.7: port 4 reset error -110
hub 4-0:1.0: hub_port_status failed (err = -32)
usb 4-4: new high speed USB device using ehci_hcd and address 59
usb 4-4: new high speed USB device using ehci_hcd and address 73
usb 4-4: new high speed USB device using ehci_hcd and address 80
ehci_hcd 0000:00:1d.7: port 4 reset error -110
hub 4-0:1.0: hub_port_status failed (err = -32)

然后lsusb根本没有反应. 于是从昨天开始就在找这个原因, 因为以前装的很多debian系统根本没这个问题, 无论是sarge还是etch.

结果这次升级到lenny就出了这么个状况.

开始走了一个很大的弯路, 因为google到有人说这个问题可能是acpi问题引起的, 我想也有可能,因为这个机器是个T40的本子. 于是想连acpi一起配好吧,于是acpid,cpufreqd一顿研究, 问题还是没好,U盘插上灯连亮都不给我亮一下.

结果今晚忽然想起来我还没搜过这个错误提示呢, 结果按上面ehci_hcd的错误提示一搜, 马上就有了结果(在 这里 ).原来挂不上U盘的原因是模块造成的. 以前就听说过这几个usb模块打架,今天就让我碰上了.

问题知道了,解决方法也很简单,root模式下执行:

# rmmod ehci_hcd

然后插上U盘,盘上可爱的小绿灯又亮起来了,真开心.