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<TITLE>sane-devel: backtracking problem</TITLE>
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<META NAME="Author" CONTENT="Ivo (death@metalfield.com)">
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<META NAME="Subject" CONTENT="backtracking problem">
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<H1>backtracking problem</H1>
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<!-- received="Tue Sep 19 15:03:32 2000" -->
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<!-- isoreceived="20000919220332" -->
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<!-- sent="Wed, 20 Sep 2000 00:13:13 +0200" -->
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<!-- isosent="20000919221313" -->
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<!-- name="Ivo" -->
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<!-- email="death@metalfield.com" -->
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<!-- subject="backtracking problem" -->
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<!-- id="20000920001313.A834@ancient.demon.nl" -->
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<STRONG>From:</STRONG> Ivo (<A HREF="mailto:death@metalfield.com?Subject=Re:%20backtracking%20problem&In-Reply-To=<20000920001313.A834@ancient.demon.nl>"><EM>death@metalfield.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Tue Sep 19 2000 - 15:13:13 PDT
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<P>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0190.html">Oliver Schwartz: "Re: whereabouts of snapscan-usb.[c,h]"</A>
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<UL>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0188.html">Scott Moseman: "Good 2nd PCI SCSI Card?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0199.html">Henning Meier-Geinitz: "Re: backtracking problem"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0199.html">Henning Meier-Geinitz: "Re: backtracking problem"</A>
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<HR NOSHADE><P>
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<P>
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Hi,
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<BR>
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I'd like to report a problem with backtracking and ask you for advice.
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<BR>
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<P>Here's the information:
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<BR>
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<P>- Scanner name: ScanMagic 9636 S
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<BR>
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(but it's recognized as a Mustek ScanExpress 12000SP by SANE-- why?)
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<BR>
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- Debug output from scanimage:
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<BR>
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<P>[sanei_debug] Setting debug level of mustek to 4.
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<BR>
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[mustek] SANE Mustek backend version 1.0 build 96 (SANE 1.0.3)
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<BR>
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[mustek] sane_init: reading config file `mustek.conf'
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<BR>
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[mustek] sane_init: config file line 7: trying to attach `scsi MUSTEK * Scanner'
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<BR>
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[mustek] sane_init: config file line 9: option buffersize ignored, was set before any device name
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<BR>
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[mustek] sane_init: config file line 10: option lineart-fix ignored, was set before any device name
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<BR>
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[mustek] sane_init: config file line 12: trying to attach `scsi SCANNER'
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<BR>
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[mustek] attach: trying device /dev/sgc
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<BR>
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[mustek] dev_open: /dev/sgc is a SCSI device
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<BR>
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[mustek] dev_open: wanted 8 kbytes, got 8 kbytes buffer
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<BR>
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[mustek] attach: SCSI Vendor: `SCANNER ' Model: ` ' Rev.: `2.02'
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<BR>
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[mustek] attach: SCSI Type: Scanner; ANSI rev.: 1
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<BR>
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[mustek] attach: SCSI flags:
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<BR>
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[mustek] attach: inquiry output:
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<BR>
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[mustek] 06 00 01 01 5b 01 00 00 53 43 41 4e 4e 45 52 20 ....[...SCANNER
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<BR>
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[mustek] 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20
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<BR>
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[mustek] 32 2e 30 32 4d 55 53 54 45 4b 20 20 20 43 30 36 2.02MUSTEK C06
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<BR>
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[mustek] 20 53 31 32 49 44 57 4d 31 32 33 37 39 37 01 40 S12IDWM123797.@
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<BR>
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[mustek] 01 03 01 01 00 00 00 00 00 00 00 00 00 00 00 00 ................
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<BR>
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[mustek] 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff ................
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<BR>
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[mustek] attach: found Mustek scanner (new firmware format)
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<BR>
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[mustek] attach: old firmware revision system
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<BR>
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[mustek] attach: firmware revision 2.02
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<BR>
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[mustek] attach: scanner id: C06 S12IDW
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<BR>
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[mustek] attach: this is probably a ScanExpress series scanner
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<BR>
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[mustek] attach: this is a single-pass scanner
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<BR>
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[mustek] attach: found Mustek ScanExpress 12000SP flatbed scanner, 1-pass, SE
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<BR>
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[mustek] sane_init: config file line 14: buffersize set to 1024 kb for /dev/sgc
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<BR>
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[mustek] sane_init: config file line 15: enabling lineart-fix for /dev/sgc
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<BR>
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[mustek] sane_init: config file line 17: trying to attach `/dev/scanner'
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<BR>
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[mustek] attach: trying device /dev/scanner
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<BR>
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[mustek] dev_open: Invalid argument: can't open /dev/scanner as a SCSI device
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<BR>
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[mustek] dev_open: Invalid argument: can't open /dev/scanner as an AB306N device
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<BR>
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[mustek] dev_open: can't open /dev/scanner
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<BR>
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[mustek] sane_init: config file line 19: option buffersize ignored, was set before any device name
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<BR>
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[mustek] sane_init: config file line 20: option lineart-fix ignored, was set before any device name
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<BR>
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[mustek] sane_get_devices
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<BR>
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device `mustek:/dev/sgc' is a Mustek ScanExpress 12000SP flatbed scanner
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<BR>
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[mustek] sane_exit
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<BR>
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<P>- Problem description:
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<BR>
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I've managed to get the SCSI ISA card working with the g_NCR5380 driver and
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<BR>
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ncr_addr=0x280 dtc_3181e=1 options. Scanning was very slow, so I changed the
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<BR>
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USLEEP_SLEEP value to a minimum (1). I also changed USLEEP_WAITLONG define to
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<BR>
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1. Now the speed is bearable, but with color scans, backtracking occurs. I've
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<BR>
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tried everything I could find on the Mustek troubleshooting page. The SCSI
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<BR>
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buffersize SG_BIG_BUFF in /usr/include/scsi/sg.h has been set to 130560
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<BR>
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(prior to compiling SANE) and as you can see in the debug output, buffersize
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<BR>
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is increased to 1024 kb by the mustek backend. Still, backtracking occurs the
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<BR>
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same. Force backtracking and scan speed options do not seem to be available
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<BR>
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for this scanner (have not seen them configurable in xsane) and increasing
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<BR>
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dpi by one does not help. I'd like very much to eliminate this backtracking
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<BR>
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problem. Apart from this, I've seen only good things from this scanner, SANE
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<BR>
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and the mustek backend.
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<BR>
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<P>Hoping to hear from you,
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<BR>
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Ivo
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<BR>
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<P><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:%20backtracking%20problem&In-Reply-To=<20000920001313.A834@ancient.demon.nl>">majordomo@mostang.com</A>
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</PRE>
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<HR NOSHADE>
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<UL>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0190.html">Oliver Schwartz: "Re: whereabouts of snapscan-usb.[c,h]"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0188.html">Scott Moseman: "Good 2nd PCI SCSI Card?"</A>
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<!-- nextthread="start" -->
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0199.html">Henning Meier-Geinitz: "Re: backtracking problem"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0199.html">Henning Meier-Geinitz: "Re: backtracking 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>Tue Sep 19 2000 - 15:03:57 PDT</EM>
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