[sane-devel] Cannot get hp scanjet 8200 working
dplatt at radagast.org
Fri Nov 25 03:24:00 UTC 2016
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
- 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
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