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<!-- received="Fri May 22 04:09:40 1998 PDT" -->
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<!-- sent="Fri, 22 May 1998 13:06:49 +0200" -->
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<!-- name="Bernd Schroeder" -->
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<!-- email="bernd@aquila.muc.de" -->
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<!-- subject="Re: Problems with microtek-backend" -->
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<!-- inreplyto="m0ycYVS-000JAzC@yoo-hoo.ai.mit.edu" -->
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<title>sane-devel: Re: Problems with microtek-backend</title>
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<h1>Re: Problems with microtek-backend</h1>
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<b>Bernd Schroeder</b> (<a href="mailto:bernd@aquila.muc.de"><i>bernd@aquila.muc.de</i></a>)<br>
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<i>Fri, 22 May 1998 13:06:49 +0200</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#226">[ date ]</a><a href="index.html#226">[ thread ]</a><a href="subject.html#226">[ subject ]</a><a href="author.html#226">[ author ]</a>
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<li> <b>Next message:</b> <a href="0227.html">Brian Macy: "Re: NT frontend"</a>
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<li> <b>Previous message:</b> <a href="0225.html">becka@rz.uni-duesseldorf.de: "Re: NT frontend"</a>
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<li> <b>In reply to:</b> <a href="0217.html">Matto Marjanovic: "Re: Problems with microtek-backend"</a>
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Hi,<br>
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<p>
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On Thu, May 21, 1998 at 12:47:50PM -0400, Matto Marjanovic wrote:<br>
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<i>> </i><br>
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<i>> From: <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a></i><br>
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<i>> Date: Thu, 21 May 1998 12:24:03 +0200 (MET DST)</i><br>
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<i>> </i><br>
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<i>> Hello Matthew,</i><br>
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<i>> </i><br>
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<i>> I am the programmer of the umax-backend.</i><br>
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<i>> Since sane-0.73 my system hangs when I let the</i><br>
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<i>> microtek (1) backend enabled.</i><br>
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<i>> ...</i><br>
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<i>> </i><br>
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<i>> My first guess is that the problem is that the microtek backend calls</i><br>
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<i>> INQUIRY asking for all 96 bytes at once; I noticed that other backends</i><br>
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<i>> do this in two parts --- asking for the std. bytes first, and then</i><br>
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<i>> getting the device specific ones in a second call. Maybe this is</i><br>
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<i>> hanging the bus, and that hangs your system? (Something to fix, either</i><br>
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<i>> way.)</i><br>
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<p>
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I think this your response to an email you have received from Oliver.<br>
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He sent me an email later in which he told me that he was not<br>
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definitely sure which backend causes the problem. But I don't think<br>
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that calling INQUIRY with a result size of 96 bytes lets the system hang.<br>
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As far as I have seen most backends call INQUIRY only once with a reply<br>
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length of more than 5 bytes.<br>
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<p>
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As I wrote in an earlier mail there is/was a bug in the initialization<br>
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function of the microtek2 backend, so I suspect that this backend causes the<br>
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problem. I have (hopefully) fixed the bug and have asked Oliver to check<br>
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whether the fix works, but I don't know, if he has the time to do so.<br>
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<p>
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Therefore I would like to ask if someone, who has experienced the same<br>
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problem, is willing to test this bugfix and tell me the results. This<br>
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would help to ensure that this bug will definitely be eliminated in<br>
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later releases of sane.<br>
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<br>
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A version of this backend (which is not the latest one, but includes the<br>
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fix) is available on <a href="http://www.muc.de/~bernds/mtek2.tar.gz">http://www.muc.de/~bernds/mtek2.tar.gz</a> .<br>
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<p>
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Of course, I had not expected that this first version of the backend is<br>
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completely free of bugs, but a bug that causes the whole system to hang,<br>
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is very bad and should be eliminated as quickly as possible. <br>
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<p>
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<i>> I plan to attack my backlog of scanner-mail over the coming long weekend</i><br>
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<i>> (as it is in the US)....</i><br>
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<p>
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Yes, I have a four day weekend, too.<br>
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<p>
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Bernd<br>
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<p>
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<pre>
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--
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Bernd Schroeder
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Email: <a href="mailto:bernd@aquila.muc.de">mailto:bernd@aquila.muc.de</a>
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PGP public key available: <a href="mailto:pgp@aquila.muc.de">mailto:pgp@aquila.muc.de</a> | Subject: send key
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<p>
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<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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</pre>
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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="0227.html">Brian Macy: "Re: NT frontend"</a>
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<li> <b>Previous message:</b> <a href="0225.html">becka@rz.uni-duesseldorf.de: "Re: NT frontend"</a>
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<li> <b>In reply to:</b> <a href="0217.html">Matto Marjanovic: "Re: Problems with microtek-backend"</a>
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<!-- nextthread="start" -->
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<!-- reply="end" -->
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</ul>
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