On 11/23/2016 09:16 PM, Wolf Drechsel wrote: > Hello Dave, > > I'm suffering from "avision" trouble as well (you may have read my > recent posts to this list). > I'd like to offer my ubuntu 16.10 / hp7400c setup for further testing. I > sent my log files to this list on Nov 7th, maybe they can be useful.
Hi, Wolf! I read through your messages and glanced at the logs. If I understand correctly, your situation seems to be a "nothing much had changed, but it no longer works" problem? The Avision backend hasn't changed in some time (early 2015 was the last release, I think), which rather points the problem elsewhere. Unfortunately there are at least four possible culprits: - Kernel changes - libusb changes - Problems in the scanner itself - Problems in your PC. To pin this down I'd suggest a classic "change one part at a time" elimination test sequence. What you might try: - Test the scanner with the current Ubuntu/SANE distribution on another PC. If it scans OK there, this would rather rule out the scanner itself as the problem. - Test your PC's USB setup with some non-scanner high-speed transfers. One way would be to plug in a USB hard driver or data stick, and then "dd if=/dev/sdB bs=$((1024*1024)) of=/dev/null" (substitute the correct device identifier) and see if the transfer works successfully or if it triggers the USB hang. (Based on what you report, I've got a nasty feeling that your motherboard host controller may be ill... works OK for low-speed transfers, but hangs up somehow during sustained high-speed transfers. The fact that it times out and leaves the bus hung is troubling.) - Boot up a different Linux distribution on your laptop (e.g. Knoppix) and see if you can get the scanner to work reliably. If so it might point to a recent change in your normal kernel and/or libusb as being responsible. -- sane-devel mailing list: sane-devel@lists.alioth.debian.org http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/sane-devel Unsubscribe: Send mail with subject "unsubscribe your_password" to sane-devel-requ...@lists.alioth.debian.org