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<TITLE>sane-devel: Re: HP backend problem...</TITLE>
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<META NAME="Author" CONTENT="Jens Petersohn (jkp@mccoy.penguinpowered.com)">
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<META NAME="Subject" CONTENT="Re: HP backend problem...">
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<H1>Re: HP backend problem...</H1>
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<STRONG>From:</STRONG> Jens Petersohn (<A HREF="mailto:jkp@mccoy.penguinpowered.com?Subject=Re:%20HP%20backend%20problem...&In-Reply-To=<200008102016.PAA24995@scotty.petersohn.net>"><EM>jkp@mccoy.penguinpowered.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Thu Aug 10 2000 - 13:16:04 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0089.html">mh: "weird speed difference with parallel port scanner"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0087.html">Bernard MICHAUD: "Re: Microtek Phantom with ppSCSI"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0028.html">Peter Kirchgessner: "Re: HP backend problem..."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0209.html">Jens Petersohn: "Re: HP backend problem..."</A>
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<P>
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Hi Peter,
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<BR>
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<P>thanks for the help. In the mean time I've tried several versions of the
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<BR>
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SCSI driver (.28, .29 and .30 -- latest), but no luck. I've tried your
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<BR>
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suggestion, and that seems to change the width of the "corruption"
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<BR>
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bars. I've poked around some more in the source code and attempting to
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<BR>
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analyze the debugging output, but my knowledge of SCSI and it's
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<BR>
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methods are non-existent.
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<BR>
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<P>Is the PROM in the scanner old perhaps? Is it upgradable? The /proc/scsi/scsi
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<BR>
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entry says it's version
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<BR>
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<P> Vendor: HP Model: C5110A Rev: 3638
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<BR>
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Type: Processor ANSI SCSI revision: 02
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<BR>
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<P>Thanks,
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<BR>
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<P>Jens
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<BR>
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<P><EM>>
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</EM><BR>
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<EM>> Jens Petersohn wrote:
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</EM><BR>
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<EM>> Hi Jens,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I dont know how to solve the problem. But I think it must have something
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</EM><BR>
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<EM>> to do with the SCSI interface. The image looks like some bytes have been
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</EM><BR>
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<EM>> lost. Two of the strips in the image have exactly the same size of
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</EM><BR>
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<EM>> 393216 Bytes == 384KB. One of strips is one byte more than 416KB. Both
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</EM><BR>
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<EM>> values are multiple of 32KB. If you have the sources of the hp-backend,
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</EM><BR>
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<EM>> you can try to change the value of HP_PIPEBUF in file hp-scl.c from
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</EM><BR>
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<EM>> 32768 to 16384 or 4096. When the compilation was successful, you should
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</EM><BR>
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<EM>> see the new value in the log file with the messages "entering request to
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</EM><BR>
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<EM>> read num bytes" and "trying to read num bytes".
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</EM><BR>
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<EM>> I am not sure if this solves the problem and if so why.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> --Peter
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</EM><BR>
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<P><PRE>
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--
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"We are Microsoft. UNIX is irrelevant. OS/2 is irrelevant. Openness
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is futile. Prepare to be assimilated."
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-- <A HREF="mailto:prs@turing.org?Subject=Re:%20HP%20backend%20problem...&In-Reply-To=<200008102016.PAA24995@scotty.petersohn.net>">prs@turing.org</A>
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-- (quoted by Eric Berggren)
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<P>--
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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:%20HP%20backend%20problem...&In-Reply-To=<200008102016.PAA24995@scotty.petersohn.net>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0089.html">mh: "weird speed difference with parallel port scanner"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0087.html">Bernard MICHAUD: "Re: Microtek Phantom with ppSCSI"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0028.html">Peter Kirchgessner: "Re: HP backend problem..."</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0209.html">Jens Petersohn: "Re: HP backend problem..."</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Thu Aug 10 2000 - 13:17:25 PDT</EM>
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