Snapscan USB hangs - compression?

From: John Coppens (
Date: Thu Jun 28 2001 - 21:56:27 PDT

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    Hello all.

    No one bit the first time around. I still get hangs while transferring
    images from the Snapscan scanner to the computer. A new hint: after
    the hang, I try to rmmod the module 'uhci.o', which normally works,
    then try to re-insmod it, which sometimes works, but at times segfaults
    during initialization, and then cannot be removed.

    I'd really appreciate a suggestion!
    > I just recompiled sane/xsane for the 2.4.5 kernel I installed, hoping the
    > problem would disappear, but no luck.
    > When I scan (snapscan 1212U) an image with lots of white (probably
    > saturated), the transmission to the PC hangs. Lowering contrast, or
    > even turning the original 90 degrees, solves the problem. I suspect the
    > image data is compressed when sending though USB. Could there be an
    > bug in the protocol? Either in the Snapscan firmware, or at the receiving
    > end?
    > John

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