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<TITLE>sane-devel: Re: Snapscan USB hangs - compression?</TITLE>
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<META NAME="Author" CONTENT="Steve Underwood (steveu@coppice.org)">
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<META NAME="Subject" CONTENT="Re: Snapscan USB hangs - compression?">
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<H1>Re: Snapscan USB hangs - compression?</H1>
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<!-- received="Fri Jun 29 06:16:51 2001" -->
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<!-- sent="Fri, 29 Jun 2001 21:29:09 +0800" -->
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<!-- name="Steve Underwood" -->
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<!-- subject="Re: Snapscan USB hangs - compression?" -->
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<!-- inreplyto="200106290452.f5T4qKW20326@panda.mostang.com" -->
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<STRONG>From:</STRONG> Steve Underwood (<A HREF="mailto:steveu@coppice.org?Subject=Re:%20Snapscan%20USB%20hangs%20-%20compression?&In-Reply-To=<3B3C82A5.8DC84CBC@coppice.org>"><EM>steveu@coppice.org</EM></A>)<BR>
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<STRONG>Date:</STRONG> Fri Jun 29 2001 - 06:29:09 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0321.html">DStevenson: "Re: Device I/O error: MD8.0; HP6200, AHA2940 SCSI"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0319.html">Oliver Neukum: "Re: scanjet 5200c usb and red hat 7.1"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0318.html">John Coppens: "Snapscan USB hangs - compression?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0334.html">John Coppens: "Re: Snapscan USB hangs - compression?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0334.html">John Coppens: "Re: Snapscan USB hangs - compression?"</A>
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<P>
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John Coppens wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Hello all.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> No one bit the first time around. I still get hangs while transferring
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</EM><BR>
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<EM>> images from the Snapscan scanner to the computer. A new hint: after
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</EM><BR>
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<EM>> the hang, I try to rmmod the module 'uhci.o', which normally works,
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</EM><BR>
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<EM>> then try to re-insmod it, which sometimes works, but at times segfaults
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</EM><BR>
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<EM>> during initialization, and then cannot be removed.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I'd really appreciate a suggestion!
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > I just recompiled sane/xsane for the 2.4.5 kernel I installed, hoping the
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</EM><BR>
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<EM>> > problem would disappear, but no luck.
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > When I scan (snapscan 1212U) an image with lots of white (probably
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</EM><BR>
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<EM>> > saturated), the transmission to the PC hangs. Lowering contrast, or
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</EM><BR>
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<EM>> > even turning the original 90 degrees, solves the problem. I suspect the
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</EM><BR>
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<EM>> > image data is compressed when sending though USB. Could there be an
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</EM><BR>
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<EM>> > bug in the protocol? Either in the Snapscan firmware, or at the receiving
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</EM><BR>
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<EM>> > end?
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > John
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</EM><BR>
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<P>A USB snapscan scanner uses exactly the same host communication protocol
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<BR>
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as a SCSI one, and no compression is used. Apart from that I can't help
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<BR>
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much.
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<BR>
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<P>Regards,
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<BR>
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Steve
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<BR>
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<P><PRE>
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--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20Snapscan%20USB%20hangs%20-%20compression?&In-Reply-To=<3B3C82A5.8DC84CBC@coppice.org>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0321.html">DStevenson: "Re: Device I/O error: MD8.0; HP6200, AHA2940 SCSI"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0319.html">Oliver Neukum: "Re: scanjet 5200c usb and red hat 7.1"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0318.html">John Coppens: "Snapscan USB hangs - compression?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0334.html">John Coppens: "Re: Snapscan USB hangs - compression?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0334.html">John Coppens: "Re: Snapscan USB hangs - compression?"</A>
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<EM>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Fri Jun 29 2001 - 06:18:55 PDT</EM>
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