Strange USB Scaner Problem

NoOp glgxg at
Tue May 22 18:23:24 UTC 2007

On 05/22/2007 11:13 AM, norman wrote:
> , 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.
> Norman

I think others have asked, but don't recall seeing an answer; what
scanner model do you have, what program are you using for scanning, and
what (if any) sane backend are you using?

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