Hello Dave, great you're taking care for me. A few days ago I filed a bug report which contains most of your requested info:
https://bugs.launchpad.net/bugs/1643544 The test you asked for have already been carried out: > > - 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. > On my laptop, running ubuntu 16.04, the problem occurs as well. And: On my desktop, with fedora 24 - the problem ALSO EXISTS > - 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.) > Last days, I copied 3 250GB USB hard disks via USB. No problems. > - 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. > 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. My conclusions from these experiments: * scanner is o.k. * desktop is o.k. * kernel 4.X causes problems, distro-independently Let me know if I can provide further information. Cheers, Wolf --
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