The current microtek backend maintainer is currently busy (final exams).
He will probably be back in a week or so.
Your problem is related to the new gamma table download code introduced in
the microtek backend. I suspect it is because your scanner supports > 24
bit scans. As far as I understand the gamma code, it currently doesn't handle
this (but I haven't found a reason why it should fail).
Quick and dirty hack (disabling gamma tables altogether): edit
sane-1.0.1/backend/microtek.c (function download_gamma) to do
return SANE_STATUS_GOOD;
somewhere early. Right before the debug message statement is probably a good
place.
This should make it work again, but without gamma correction support.
For a real solution someone has to find the bug in the SCSI command set
documentation.
Hope that helps,
Klaus
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