ScanJet 4400c 150 dpi only grey, other DPI settings work

Marco Moock <[email protected]>
Newsgroups gmane.comp.graphics.scanning.sane.devel
Message-ID <[email protected]> 
Hello!

When using my HP 4400c with xsane and 150 dpi, the outcome is just a
grey/blue picture, not real content of the page. Other DPI settings like
300 produce a normal scan.

I also noticed that the scanner moved forward, stops, then moves a bit
backwards and then forward again. This happens multiple times until the
page is scanned.

How can I further diagnose that and create a useful bugreport?

-- 
kind regards
Marco
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