[sane-devel] Using "scanimage" under Gentoo

[Louis Lagendijk]

Hi Rainer
to get an indication where the issue is: can you please repeat the same
tests with USB connection?  That ill help decide if the issue is in the
backend proper of the BJNP code....
Thanks, Louis

On Fri, 2020-02-14 at 14:28 +0100, Dr Rainer Woitok wrote:
> Olaf,
> 
> I promised to run tests  using the current version of "sane-backends" 
> as
> well as my Canon Pixma scanner.   I used a three sheets, six pages
> color
> original and scanned with "--source 'ADF Duplex'":
> 
> Test 1: Run with "export SANE_DEBUG_BJNP=127".   After scanning the
> 4-th
>         page successfully, the scanner started to pull in the last
> sheet
>         before the second sheet was completely moved out of the way,
> re-
>         sulting in the scanner's hard- or firmware  pulling some sort
> of
>         emergency brake and stopping the scan.
> 
> Test 2: To see whether this was just the debog-output getting in the
> way
>         I did this test WITHOUT specifying "export
> SANE_DEBUG_BJNP=127".
>         This time the scanner totally "forgot"  to scan the reverse
> side
>         of the  second sheet,  immediately scanned  the last
> sheet,  and
>         then claimed the scan to having been successful.   Sorry, no
> de-
>         bug data available :-(
> 
> Test 3: Again with "export SANE_DEBUG_BJNP=127".   This test did
> produce
>         six correct page images without throwing any errors.
> 
> Test 4: Again with  "export SANE_DEBUG_BJNP=127".   This test,  too,
> did
>         produce six correct page images without throwing any errors.
> 
> Test 5: Without exporting "SANE_DEBUG_BJNP".  Ran successfully.
> 
> So two out of five tests failed, and they failed in different ways,
> ind-
> icating that there might be still timing or communication problems.
> 
> I've compressed the debug output  from tests 1 and 3,  but the files
> are
> still huge:
> 
>    $ ls -l *.bz2
>    -rw------- 1 rainer rainer 28659462 2020-02-14 13:35
> paperjam.log.bz2
>    -rw------- 1 rainer rainer 56919612 2020-02-14 13:37
> success.log.bz2
>    $
> 
> As per your suggestions  I'll send these files  in two separate mails
> as
> attachments to both, yourself and the list and will leave it to the
> list
> moderator to decide.
> 
> Sincerely,
>   Rainer
>