Comment # 18 on bug 905034 from Johannes Meixner

Many thanks for your test on different hardware!

According to
https://bugzilla.opensuse.org/show_bug.cgi?id=903839#c15
I don't think the actual hardware is the root cause.

But I think the root cause is related to the hardware.

Reasoning:

Your office12-scanimage-scan11.pnm in attachment#613854 [details]
has wrong colors but
your office12-image150.pnm in attachment#613855 [details]
has right colors and
both are made by "scanimage --mode color --resolution 150".

When the same scan program runs two times but results different data
I cannot imagine a reason how the difference can be caused by
the software.

Both office12-scanimage-scan11.pnm and office12-image150.pnm
have same size so that the same amount of data is read
from the scanner but the data itself differs.
This indicates that what comes in from the scanner differs.

Now the scanner itself could be somehow a bit damaged
but I think this is unlikely.

For now it is only a gut feeling but I think that something
goes wrong during USB data transfer in the software that
is used for the low-level USB data transfer.

I noticed that on your office12-scanimage-scan11.pnm the
colors are o.k. on the top and then colors becomes more
and more wrong starting at the end of each line but then
towards the end more and more the whole lines get more and more
wrong colors ("white" gets first yellow and then it becomes red).

For me it looks as if while the data is being read from the scanner,
the data becomes more and more distorted and this seems to indicate
that something goes more and more wrong during USB data transfer.

When it is not the actual hardware, then hardware related issues
are basically issues in the hardware related software which is
the kernel, low-level libraries (like libusb), and driver software
on application level (like the genesys driver in SANE).

I would like to see what USB related kernel modules are
actually used on your computer.

See
https://bugzilla.opensuse.org/show_bug.cgi?id=903839#c20
--------------------------------------------------------------------------
When using kernel-desktop (seems to be the default for 13.2)
then there are no USB-related kernel modules.

When using kernel-default (seems to be not the default for 13.2)
then there are USB-related kernel modules.
--------------------------------------------------------------------------

Please install kernel-default and boot with it (you may have to
manually select it in the Grub boot menue) and then run

# lspci -v | egrep -i 'usb|hci'

# lsmod | egrep 'usb|hci'

and post the output of both commands here.