xsane scsi scanner "Error during device I/O"

[Per olof Ljungmark]

Hi,

6.1-STABLE
xsane & xsane-backends
slide scanner Microtek 35 (supported according to docs)

pass3: <Polaroid Polaroid 35/LE 1.40> Fixed Scanner SCSI-CCS device

on

ahc1: <Adaptec 2930CU SCSI adapter> port 0x1400-0x14ff mem 
0xf0901000-0xf0901fff irq 22 at device 11.0 on pci5

The brief "Error during device I/O" is the only message I get, nothing 
else anywhere.
What can I do to try to solve this?

Thanks,