Matthew, thank you for your help.
The scanner now works in regular mode. Interesting enough,
it freezes in force_nibble mode.
For those who have problems with Canons N340P and FB330P.
1. Set manually the io ranges and dma mode in BIOS
For me these were 378-37F, 778-77D, IRQ 7
2. Set ECC+EPP mode for your parallel port in BIOS.
3. Add the following line to the modprobe.conf
(/etc/modeprobe.d/options on Ubuntu)
options parport_pc io=0x378 io_hi=0x778 dma=1
4. Reload the parallel port related modules using modprobe
(my choice would be to restart)
5. If the scanner still does not work, try putting a comment
on force_nibble/removing the comment in canon_pp.conf.
----------------------------------------
> CC: sane-devel lists.alioth.debian.org
> From: stauffguarana.org
> Subject: Re: [sane-devel] Canon_pp freezes halfway
> Date: Wed, 29 Nov 2006 23:33:15 +1100
> To: kselmakhotmail.com
>
> Hi there!
>
> On 29/11/2006, at 11:22 AM, selma kapetanovic wrote:
> ...
> > I am running
> > ..
> > * Parallel port is in EPP mode (BIOS setting)
>
> I'll get back to this...
>
> > It scans most often (not always) in black and
white. For color mode
> > the number of "reads" varies from two to
four.
>
> Hmm.. that's quite weird, but I'm guessing it's just
the increased
> amount of data in colour mode.
>
> > I spent quite some time trying to make it work.
Should I have known
> > it takes so much time, I would toss the scanner in
the garbage.
> > At this point it is more of a challenge. I know
that I am not the
> > only person who has the problem and I want to post
the solution to
> > the Ubuntu web site along with a recommendation
not to buy canon
> > scanners.
>
> Well, I'm probably not telling you anything you don't
know, but it's
> not so much the scanner as the port.
>
> Parallel ports are flakey things - it's amazing they
ever work
> really. They're just not really designed to push the
large amounts
> of data scanners need to move.
>
> > ...
> > [canon_pp] detect_mode: Port supports ECP-H.
> > [canon_pp] detect_mode: Port supports interrupts
> ...
>
> So according to the probing done by libieee1284, the
port supports
> ECP-H transfers and interrupts, but no mention of DMA.
Generally
> speaking I've had the most success in the past using
ECP and DMA mode
> or pure software mode, but pure software is very slow
and nasty - DMA
> is much preferred if you can get it working.
>
> Anyway, I think the first thing to try is setting the
BIOS setting to
> "ECP+EPP" if it has such an option, instead
of "EPP". After that you
> should maybe allocate a fixed IRQ to the parallel port
(yes, I know,
> plug&play - but it's just more reliable this way!).
Once you've done
> that you can try playing with the parport_pc module
settings to try
> and get DMA transfers working. I wish there was an
easier way, but
> that's pretty much it.
>
> Hope that helps!
>
> Cheers,
>
> - Matthew
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