[sane-devel] Cannot get hp scanjet 8200 working

[Wolf Drechsel]

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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