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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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<!-- received="Wed Aug 23 11:57:42 2000" -->
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<!-- sent="Wed, 23 Aug 2000 14:05:34 -0500 (CDT)" -->
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<!-- name="Jens Petersohn" -->
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<!-- subject="Re: HP backend problem..." -->
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<STRONG>From:</STRONG> Jens Petersohn (<A HREF="mailto:jkp@mccoy.penguinpowered.com?Subject=Re:%20HP%20backend%20problem...&In-Reply-To=<200008231905.OAA09061@scotty.petersohn.net>"><EM>jkp@mccoy.penguinpowered.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Aug 23 2000 - 12:05:34 PDT
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<P>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0210.html">Thomas Haberland: "Mustek SP12000pro Problem"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0208.html">Oliver Rauch: "Re: lamp control for umax scanners"</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="0212.html">Douglas Gilbert: "Re: HP backend problem..."</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0212.html">Douglas Gilbert: "Re: HP backend problem..."</A>
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<P>
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Hi all,
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<BR>
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<P>problem found (and a tale of woe)!
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<BR>
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<P>For several years I've shared the SCSI scanner between two computers,
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<BR>
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my wife's and mine. My wife has an Adaptec 152x card set to SCSI ID 7
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<BR>
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and my computer has an Adaptec 2940 (1.23) set to ID 6. The scanner
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<BR>
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is set to ID 2 (there is also a tape drive on ID 5).
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<BR>
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This worked fine, running Win95 on my wife's system and Linux 2.0.36
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<BR>
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on mine (and a really early version of SANE, 0.71 I think).
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<BR>
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Then, sometime last year, I upgraded my system to the 2.2.14 kernel
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<BR>
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plus all the user mode stuff, but didn't get around to installing
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<BR>
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a new version of SANE. When I finally did install SANE, I started to
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<BR>
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have the corrupted image problem that I had documented in an earlier
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<BR>
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email, thinking the problem had to be SANE or the SCSI subsystem in
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<BR>
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the 2.2.14 kernel. Based on this assumption I build kernels with
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<BR>
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all sorts of versions of the sg driver (including the new V3) and
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<BR>
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lots of versions of the AIC driver. Nothing worked. I never suspected
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<BR>
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that the problem might be caused by my wife's computer (which had
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<BR>
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been upgraded to Win98 somewhere along the way).
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<BR>
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Finally, in desperation, I shut off my wife's computer, and voila,
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<BR>
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the problem disappeared. Armed with that information, I quickly
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<BR>
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tracked down the culprit, STIMON.EXE. STIMON.EXE (the WDM StillImage-
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<BR>
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Monitor) queries the scanner every so often (about every 100 ms as
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<BR>
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far as I am able to determine). The scanner firmware however
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<BR>
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seems to be a strickly sequence/task oriented piece of software
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<BR>
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that could not deal with the fact that a query would be arriving
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<BR>
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from a different SCSI ID while a scan was initated and in progress
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<BR>
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from another SCSI ID. Disabling STIMON.EXE solved the problem on
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<BR>
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the Linux side, but disabled the scanning capability on the Windows
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<BR>
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machine. Turns out though, the Control Panel applet for Cameras and
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<BR>
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Scanners on Windows allows you to disable "Device Event Messages".
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<BR>
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With this disabled, I could run STIMON.EXE again and scan from both
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<BR>
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Windows and Linux without problems.
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<BR>
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Interesting side note: The firmware of the scanner crashes completely
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<BR>
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if two hosts attempt to scan simultaniously. It seems to need a
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<BR>
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power cycle to resurrect it.
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<BR>
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<P>Thank you all very much for your suggestions!
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<BR>
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<P>Cheers,
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<BR>
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<P>Jens
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<BR>
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<P><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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<EM>>
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</EM><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:%20HP%20backend%20problem...&In-Reply-To=<200008231905.OAA09061@scotty.petersohn.net>">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="0210.html">Thomas Haberland: "Mustek SP12000pro Problem"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0208.html">Oliver Rauch: "Re: lamp control for umax scanners"</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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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0212.html">Douglas Gilbert: "Re: HP backend problem..."</A>
|
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<LI><STRONG>Reply:</STRONG> <A HREF="0212.html">Douglas Gilbert: "Re: HP backend problem..."</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>Wed Aug 23 2000 - 11:58:03 PDT</EM>
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