I'm really stumped on this, esp. since you appear to have the exact same
model of scanner that I do, and of all the Microtek varieties, that is
the one with which the backend is guaranteed to work.
I believe the only way to lock up the system is by some bad interaction
with the SCSI cards, and it's not obvious where that could be happening.
You said that a simple "scanimage -L" locks up your system --- very weird.
Could you send a debug log of "scanimage -L", with both SANE_DEBUG_MICROTEK
and SANE_DEBUG_SANEI_SCSI set to 255? And also, send the output of
"cat /proc/scsi/scsi", "cat /proc/scsi/aha152x/*", etc.
-matt m.
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