Strange USB Scaner Problem

norman norman at
Tue May 22 18:13:02 UTC 2007

, snip >

> Random disconnection is a kernel bug that is not fixed yet. Some users
> report randomly disconnecting USB devices, especially external hard
> drives. One solution is to start the system with the option "irqpoll" in
> grub, but this doesn't work for everybody, and is believed to make the
> whole system slower. The other solution is to disable USB 2.0. This will
> result in way slower read/write, but the connection remains stable.
> To disable USB 2.0, type this in the terminal:
> sudo modprobe -r ehci_hcd
> Test if the copy/write process is stable, and if you want to disable USB
> 2.0 upon boot, type:
> sudo sh -c 'echo blacklist ehci_hcd > /etc/modprobe.d/blacklist-ehci'
> sudo update-initramfs -u -k `uname -r`
> </quote>

I tried this but it did not work for me. The bar indicated that scanning
was taking place but the scanner light did not move.


More information about the ubuntu-users mailing list