Attachment 157002 Details for Bug 206094 – Analysing changes in avision CVS revisions

Analysing changes in avision CVS revisions

avision_msg (text/plain), 2.55 KB, created by Kevin R. Page on 2007-06-14 14:18:32 UTC

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Creator: Kevin R. Page

Created: 2007-06-14 14:18:32 UTC

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>
>On Thu, 2007-01-11 at 14:55 +0100, Rene Rebe wrote:
>> Yes, I do not know off hand. But svn log on the sane-avision repository will 
>> indicates changesets with the model in the name.
>
>Ok, I have checked various versions of the avision backend out from svn.
>Each time I have patched the sane-backends-1.0.18 Fedora SRPM with the
>older versions of avision.c and avision.h, and rebuilt and installed the
>RPM.
>
>I've summarised my findings below - let me know if you'd like me to try
>any other specific revisions.
>
>There is definitely a correlation between the scan head not moving and
>the "bad" noise from the scanner - i.e. when I record that the scan head
>doesn't move, there will also be the "grinding" noise from the scanner.
>
>After testing each revision I reset the USB bus and powered down and up
>the scanner - however, I wouldn't be 100% that this clears all the state
>from previous test, so if something seems out of place, let me know, and
>I'll re-test.
>
>
>Working backwards:
>
>r288: there's an initial movement from the scan head of a few mm, but
>then it doesn't move at all. No noise, though. xsane reports: "Failure
>to start scanner: error during device I/O".
>
>r286: as r288
>r258: makes the horrible noise (but louder).
>r236: as r288
>
>r227:
> Gray preview: no bad noises, preview scan is corrupted (no obvious
>pattern), scan head only moves half-way then returns.
> Colour preview: a more moderate "bad" screeching noise, scan head
>doesn't move more than 10mm.
> Gray full scan: corrupted with image kind of skewed and wrapped at
>approx. 45 degrees.
> Colour full scan: also skewed, with additional multi-colour stripes
>also skewed (they'd be vertical if it weren't for the skew).
>
>r218: as r227
>
>r210:
> Gray preview: head only moves a few mm and the bad noise is produced.
> Colour preview: head only moves a few mm; bad noise.
> Gray full scan: head moves ok, scanned image is skewed (as r227).
> Colour full scan: head moves ok, scanned image is skewed with
>multicoloured lines (as r227).
>
>r200:
> Gray preview: head moves normally, no "bad" noise, preview is a little
>dark but seems ok - no corruption.
> Colour preview: head moves normally, no "bad" noise, preview is correct
>EXCEPT for vertical multicoloured bar. There is also possibly a "thud"
>noise at the end of the scan, as if the head is hitting a stop?
> Gray full scan: head moves normally, no "bad" noise, scan is skewed but
>colouration is ok.
> Colour full scan: head moves normally, no "bad" noise, image is skewed
>with multicoloured lines (as r227).
>
>r115:
> as r200 (possibly a smaller "thud" noise).
>
>
>Hopefully this is of some help,
>
>Regards,
>
>Kev
>
>

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