Re: SCSI scanner problem with all kernels since 2.3.42

[Douglas Gilbert <dougg@torque.net>]

Tim Waugh wrote:
> I'm having problems with using xsane to acquire a preview from an HP
> ScanJet 5P connected to an AHA-2940.  2.3.42 is the last kernel that
> works right for me.
> 
> The symptom is that the scanner starts to make scanning sounds, then
> stops, and xsane says 'Error during read: Error during device I/O'.

Tim and I have been looking at this offline. The significance
of lk 2.3.43 was the addition of a new sg driver that has an
additional interface. Recent versions of SANE use that newer
sg interface. The problem that Tim reported seemed to be caused
by timeouts ** resulting in scsi bus resets. Anyway the problem
seems to disappear with the recently released SANE 1.0.4 .
[The original report was based on SANE 1.0.3 and earlier.]

There is also a problem report with the  SnapScan 1236 <--> aha152x 
combination also based on SANE 1.0.3 . This one is looking 
like an "uninitialized errno" bug fixed in SANE 1.0.4 .

** SANE's newer sg interface shortens the per command timeout
from 10 minutes to 10 seconds. Most other OSes interfaces in
SANE have a timeout value of 1 minute or more. I suspect 10 
seconds may be too short.

Doug Gilbert
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