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<TITLE>sane-devel: Re: problems with Canon scanner</TITLE>
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<META NAME="Author" CONTENT="Douglas Gilbert (dgilbert@interlog.com)">
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<META NAME="Subject" CONTENT="Re: problems with Canon scanner">
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<H1>Re: problems with Canon scanner</H1>
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<STRONG>From:</STRONG> Douglas Gilbert (<A HREF="mailto:dgilbert@interlog.com?Subject=Re:%20problems%20with%20Canon%20scanner&In-Reply-To=<390D80D6.1CB8DD3C@interlog.com>"><EM>dgilbert@interlog.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon May 01 2000 - 06:04:22 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0001.html">Steve Underwood: "SnapScan"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0009.html">Manuel Panea: "Re: problems with Canon scanner"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0010.html">abel deuring: "Re: problems with Canon scanner"</A>
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<P>
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Robin Kirkham wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> On Sunday, 30 April 2000, Douglas Gilbert wrote:
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Herman Roozenbeek wrote:
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</EM><BR>
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<EM>> > >
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</EM><BR>
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<EM>> > > I have a Canon CanoScan 300 scanner. With Sane 1.0.1 everything worked fine
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</EM><BR>
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<EM>> > > But now I have upgraded to 1.0.2 and I can't get my scanner working.
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</EM><BR>
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<EM>> > > ...
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</EM><BR>
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<EM>> > > As far as I can tell, the error occurs in "GET SCAN MODE".
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Herman,
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</EM><BR>
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<EM>> > The problem is with that command which seems like a vendor
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</EM><BR>
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<EM>> > special. The sg driver probably incorrectly guesses the
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</EM><BR>
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<EM>> > length of that command.
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Since that is a recent Linux kernel the Canon backend could
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</EM><BR>
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<EM>> > take advantage of the SG_NEXT_CMD_LEN ioctl to override the
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</EM><BR>
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<EM>> > length of the problematic command.
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > Alernatively you could go to the Canon backend web site and
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</EM><BR>
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<EM>> > hack the sg driver as suggested. [This is ugly.]
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Is this problem really a bug in the current SANE canon backend
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</EM><BR>
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<EM>> or is it a bug in the Linux sg driver?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I had been led to believe it was the latter, but ...
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</EM><BR>
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<P>Since (and including) lk 2.2.10 it has been possible for the
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<BR>
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Canon backend to override the SCSI command length as noted
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<BR>
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above. The SG_GET_VERSION_NUM ioctl() can be used to find the
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<BR>
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sg version number. So it is possible for the Canon backend
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<BR>
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to use these and save the end user from striking these type
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<BR>
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of problems in recent distributions.
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<BR>
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<P>So the bug was fixed 9 months ago. IMHO the Canon backend
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<BR>
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should have picked this up by now.
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<BR>
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<P>Doug Gilbert
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<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:%20problems%20with%20Canon%20scanner&In-Reply-To=<390D80D6.1CB8DD3C@interlog.com>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0001.html">Steve Underwood: "SnapScan"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0009.html">Manuel Panea: "Re: problems with Canon scanner"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0010.html">abel deuring: "Re: problems with Canon scanner"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Mon May 01 2000 - 06:02:40 PDT</EM>
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