[Bug 32812] After update the kernel, the external usb2 harddrive disconnects after some time

[erzhong]

Public bug reported:
https://launchpad.net/malone/bugs/32812

Affects: linux-source-2.6.12 kernel-image-2.6.12-10-386-di (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
After I upgrade the kernel to 
linux-image-2.6.12-10-686    2.6.12-10.28
from ubuntu upgrade, my external usb2 harddrive always disconnects after mounted for some time. This seldom happened when I was using the previous kernel. 

I am using kde (Kubuntu). The drive is mounted by click the icon on the
desktop. After some time, the drive will automaticly disconnects
(unmounted and dispear in /dev). If the drive is truned off and turned
on again, the device name will change. (sda -> sdb -> sdc...)