Strange USB Scaner Problem

[Jack Bowling]

On Mon, May 21, 2007 at 03:31:38PM -0700, Mitch Contla wrote:
> On 5/19/07, Amichai Rotman <amichai at iglu.org.il> wrote:
> >
> >Hi all,
> >
> >I have Canon LiDE 20 USB scanner connected to my 7.04 box.
> >
> >It worked fine with Kooka and XSane on 6.10...
> >
> >Problem: I can see the scanner in lsusb and when I fire up the apps it
> >asks me which device I want to use (I also have a BT878 TV capture card) 
> >but
> >when I hit the preview or scan buttons (in the app, not hardware) it runs
> >the percentage  till completion but the motor doesn't move and when it
> >completes it comes up as all black...
> >
> >Is it a Feisty problem or did my scanner just died at a perfect timing?
> >
> >How do I check it?
> >
> ><--snip->>
> >
> 
> Here's a couple things that have helped me when I have had sane problems:
> 
> 1. Does sane-find-scanner recognize your scanner properly?
> 2. What are permissions on /dev/bus/usb/{your_usb_addr? Mine are 664.
> 3. Have you tried rm -fr ~/.sane (use at your own risk... has solved many
> sane problems for me)?

I think this bug goes pretty deep into libusb/udev territory. My Epson
Perfection 2400 works fine on my USB v1.1 bus but errors out on my USB
v2 bus. Weird. Seems to be a timing issue at least.

Jack