Comment 330 for bug 85488

Despite the above problem I have some good news: the sysfs interface for usb seems to work. On a Gutsy LiveCD (http://cdimage.ubuntu.com/daily-live/current/ ) from a few days ago with a 2.6.22-7-generic kernel I was able to do the following after finding xsane was producing black scans:
sudo -s
for i in `find /sys -name autos*`; do echo 60 > $i; done
Close any open xsane windows

After this I started xsane again, did a preview scan and an image was produced. Hopefully these steps will allow people to test whether having their device added to the quirk list will make any difference without having to change any configuration files and then rebooting. Using a value of 0 instead of 60 does not seem to resolve the problem (and when using a value of 60, after 60 seconds of inactivity to that USB device the problem will be back).

Canoscan LiDE 20
Bus 004 Device 003: ID 04a9:220d Canon, Inc. CanoScan N670U/N676U/LiDE 20