Hello Wittawat,
you have suggested:
> [enable polling instead of interrupt handling for the scanner]
Woohoo, it works! Thank you very much for your expert analysis!
So it was some kind of problem with the USB interrupt handling
on the linkstation... which makes me a bit nervous since a lot
of device protocols rely on proper interrupt handling. I shall
check with the linkstation community whether they have some idea
to fix that and then the SANE pixma driver should work unmodified.
I'll keep you posted.
Best regards
Thomas
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