<html><head></head><body bgcolor="#ffffff" text="#2e3436" link="#2a76c6" vlink="#2e3436"><div>Hello Dave,</div><div><br></div><div>great you're taking care for me.</div><div>A few days ago I filed a bug report which contains most of your requested info:</div><div><br></div><div><a href="https://bugs.launchpad.net/bugs/1643544">https://bugs.launchpad.net/bugs/1643544</a></div><div><br></div><div>The test you asked for have already been carried out:</div><div><br></div><blockquote type="cite"><pre><br></pre><pre>- 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.
</pre></blockquote><div><br></div><div>On my laptop, running ubuntu 16.04, the problem occurs as well.</div><div>And: On my desktop, with fedora 24 - the problem ALSO EXISTS</div><div><br></div><blockquote type="cite"><pre>- 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.)
</pre></blockquote><div><br></div><div>Last days, I copied 3 250GB USB hard disks via USB. No problems.</div><div><br></div><blockquote type="cite"><pre>- 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.
</pre></blockquote><div><br></div><div>With a debian 8.6, kernel 3.2 (or so), booted for an external USB hdd - NO PROBLEM AT ALL. Multiple pages, high resolutions - everything fine. </div><div><br></div><div>My conclusions from these experiments:</div><div><br></div><div>* scanner is o.k.</div><div>* desktop is o.k.</div><div>* kernel 4.X causes problems, distro-independently</div><div><br></div><div>Let me know if I can provide further information.</div><div><br></div><div>Cheers,</div><div>Wolf</div><div><br></div><div><br></div><div>-- </div></body></html>