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<!-- received="Tue Mar 10 02:14:32 1998 PST" -->
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<!-- sent="Tue, 10 Mar 1998 11:06:08 +0100 (MET)" -->
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<!-- name="Rogier Wolff" -->
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<!-- email="R.E.Wolff@BitWizard.nl" -->
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<!-- subject="Re: Microtek woes" -->
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<!-- id="199803101006.LAA01184@cave.BitWizard.nl" -->
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<!-- inreplyto="199803100616.BAA18507@yoo-hoo.ai.mit.edu" -->
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<title>sane-devel: Re: Microtek woes</title>
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<h1>Re: Microtek woes</h1>
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<b>Rogier Wolff</b> (<a href="mailto:R.E.Wolff@BitWizard.nl"><i>R.E.Wolff@BitWizard.nl</i></a>)<br>
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<i>Tue, 10 Mar 1998 11:06:08 +0100 (MET)</i>
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<p>
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<ul>
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<li> <b>Messages sorted by:</b> <a href="date.html#67">[ date ]</a><a href="index.html#67">[ thread ]</a><a href="subject.html#67">[ subject ]</a><a href="author.html#67">[ author ]</a>
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<li> <b>Next message:</b> <a href="0068.html">Fabrice Pollet: "PB compile sane-0.71"</a>
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<li> <b>Previous message:</b> <a href="0066.html">Rogier Wolff: "Re: Microtek ScanMaker 330"</a>
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<li> <b>In reply to:</b> <a href="0064.html">Matto Marjanovic: "Microtek woes"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0073.html">Didier Carlier: "Re: Microtek woes"</a>
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</ul>
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<!-- body="start" -->
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Matto Marjanovic wrote:<br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> </i><br>
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<i>> Hey, all,</i><br>
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<i>> </i><br>
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<i>> I've been looking into why the Microtek backend has suddenly started dying</i><br>
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<i>> with sane-0.71....</i><br>
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<i>> </i><br>
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<i>> Ugh -- I'm not sure what all has caused this problem to rear its head now,</i><br>
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<i>> but part of the problem is that, apparently, the Microtek scanners do *not*</i><br>
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<i>> follow the SCSI-II standard for the REQUEST_SENSE command reply --- and the</i><br>
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<i>> Linux mid-level scsi driver (scsi.c) is coded to parse standard sense data,</i><br>
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<i>> not the weird stuff pumped out by these scanners.</i><br>
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<i>> Thus, during error conditions, the scsi driver is certainly confused by what</i><br>
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<i>> the scanner tells it. </i><br>
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<i>> </i><br>
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<i>> Perhaps one solution is to try to ignore the scsi driver's complaints, and</i><br>
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<i>> have the backend send its own REQUEST_SENSE under suspicious circumstances.</i><br>
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<i>> I'm playing with it.</i><br>
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<p>
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Note that e.g. the AHA1540 card automatically does a "request_sense"<br>
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once it notices "abnormal termination" of the previous command. <br>
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<p>
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Wether or not this is done automatically depends on the card/driver.<br>
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<p>
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Roger. <br>
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<p>
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<p>
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<pre>
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--
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<p>
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<pre>
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--
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</pre>
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<!-- body="end" -->
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<p>
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<ul>
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<!-- next="start" -->
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<li> <b>Next message:</b> <a href="0068.html">Fabrice Pollet: "PB compile sane-0.71"</a>
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<li> <b>Previous message:</b> <a href="0066.html">Rogier Wolff: "Re: Microtek ScanMaker 330"</a>
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<li> <b>In reply to:</b> <a href="0064.html">Matto Marjanovic: "Microtek woes"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0073.html">Didier Carlier: "Re: Microtek woes"</a>
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<!-- reply="end" -->
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</ul>
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