[sane-devel] Cannot get hp scanjet 8200 working

[m. allan noah]

This sounds like the typical linux usb3 problems. If you use a
sane-backends git snapshot, the problem may go away. If not, that
version also has another option: you can try to invoke your scanning
program with an additional env var: SANE_USB_WORKAROUND=1


allan

On Fri, Nov 25, 2016 at 3:57 AM, Wolf Drechsel <wd-p at trolink.de> wrote:
> 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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