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<!-- received="Fri Sep 12 14:52:49 1997 MST" -->
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<!-- sent="Fri, 12 Sep 1997 19:16:15 +0200 (MET DST)" -->
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<!-- name="becka@sunserver1.rz.uni-duesseldorf.de" -->
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<!-- email="becka@sunserver1.rz.uni-duesseldorf.de" -->
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<!-- subject="Re: mustek problems in lineart mode" -->
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<!-- id="m0x9ZKK-000BWAC@charon.beck-sw.de" -->
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<!-- inreplyto="XFMail.970911130959.Ritzert@T-Online.de" -->
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<title>sane-devel: Re: mustek problems in lineart mode</title>
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<h1>Re: mustek problems in lineart mode</h1>
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<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de"><i>becka@sunserver1.rz.uni-duesseldorf.de</i></a><br>
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<i>Fri, 12 Sep 1997 19:16:15 +0200 (MET DST)</i>
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<p>
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<li> <b>Messages sorted by:</b> <a href="date.html#178">[ date ]</a><a href="index.html#178">[ thread ]</a><a href="subject.html#178">[ subject ]</a><a href="author.html#178">[ author ]</a>
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<li> <b>Next message:</b> <a href="0179.html">becka@sunserver1.rz.uni-duesseldorf.de: "Re: HP OfficeJet Pro 1150c"</a>
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<li> <b>Previous message:</b> <a href="0177.html">Michael K. Johnson: "Re: Astra 600S, ncr 53c875 (tekram) SCI solved"</a>
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<li> <b>Next in thread:</b> <a href="0182.html">Michael Ritzert: "Re: mustek problems in lineart mode"</a>
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<li> <b>Reply:</b> <a href="0182.html">Michael Ritzert: "Re: mustek problems in lineart mode"</a>
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Hi all !<br>
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<p>
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I have received 4 private replies to that EMail, so it seems to be a common<br>
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problem we should try to track down.<br>
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<p>
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<i>> >> This doesn't always work. The scanner simply stops in the middle of the page</i><br>
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<i>> >> and scanimage seems to hang. Using xscanimage the problem is the same. Other</i><br>
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<i>> >> modes than lineart work fine.</i><br>
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<p>
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<i>> >I see similar problems here. It doesn't seem to depend on the mode (actually</i><br>
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<i>> >I cannot reproduce exact conditions under which it fails), but from time to</i><br>
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<i>> >time my MFS 12000 SP will hang and the SCSI system will be taken down with </i><br>
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<i>> >it. If you reboot the system without powering off the scanner in the meantime,</i><br>
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<i>> >the system will hang again when the SCSI driver gets loaded. </i><br>
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<p>
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<i>> Well, that's exactly what happens here. The only difference seems to be that for</i><br>
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<i>> me it only happens in Lineart mode.</i><br>
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<p>
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<i>>From the information I have received, it looks like it doesn't depend much on </i><br>
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the SCSI adaptor/subsystem. I have had reports from NCR53c400 and 53c810<br>
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plus some more which didn't tell me the adaptor. Can anyone confirm, that it<br>
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is not an NCR related problem ?<br>
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<p>
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The first idea I had was that maybe something (the scanner) is hogging the <br>
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SCSI bus for too long and resetting fails. However the hang seems to be <br>
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real hard, as my /var partition resides on an IDE HD and should thus be <br>
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able to log, even if the SCSI-Bus hangs. But what I get is :<br>
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<p>
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Aug 17 17:15:15 gate kernel: Detected scsi generic sga at scsi0, channel 0, id 6, lun 0<br>
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Aug 17 17:17:50 gate kernel: Kernel logging (proc) started.<br>
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<p>
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I.e. no error messages between opening the device and the crash.<br>
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<p>
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We should investigate further, as the effect seems to have been introduced <br>
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by SANE. I have not seen such problems with mscan and muscan.<br>
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<p>
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Several possibilities for the cause come to my mind :<br>
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<p>
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- I will try to use the strip-height option to see, if disconnect times are<br>
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the problem. <br>
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<p>
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- Moreover it would be nice, if we could check if the problem is reproducible <br>
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for given parameter sets. So if you see such a hang, write down the command <br>
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line (for scanimage) and retry. If it reproducibly hangs, please post the <br>
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parameters, so we can cross-check and maybe find a rounding-error or <br>
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something the like in the code.<br>
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<p>
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If you have other supects, please add them to the list, so we can all try to<br>
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test them out. Reproducability across different systems would be a big win, <br>
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as it would tell us that it is most likely not a timing problem.<br>
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<p>
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CU,Andy<br>
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<p>
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<pre>
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--
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Andreas Beck | Email : <<a href="mailto:becka@sunserver1.rz.uni-duesseldorf.de">becka@sunserver1.rz.uni-duesseldorf.de</a>>
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======== GGI - The Right Thing To Do : <a href="http://synergy.foo.net/~ggi/">http://synergy.foo.net/~ggi/</a> ========
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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.azstarnet.com/~axplinux/sane/">http://www.azstarnet.com/~axplinux/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="0179.html">becka@sunserver1.rz.uni-duesseldorf.de: "Re: HP OfficeJet Pro 1150c"</a>
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<li> <b>Previous message:</b> <a href="0177.html">Michael K. Johnson: "Re: Astra 600S, ncr 53c875 (tekram) SCI solved"</a>
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<!-- nextthread="start" -->
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<li> <b>Next in thread:</b> <a href="0182.html">Michael Ritzert: "Re: mustek problems in lineart mode"</a>
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<li> <b>Reply:</b> <a href="0182.html">Michael Ritzert: "Re: mustek problems in lineart mode"</a>
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