# Re: Difficulties finding my scanner.

David Mosberger-Tang (davidm@azstarnet.com)
Fri, 11 Jul 1997 20:11:28 -0700

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>>>>> On Fri, 11 Jul 1997 20:09:00 -0700, Jesse Hughes <jesse+@cmu.edu> said:

Jesse> I also think that I'm not gonna have much luck with the
Jesse> ImageReader scanner. But, I wanted to give it a try, since
Jesse> it may use a driver that's compatible with other drivers (the
Jesse> manufacturer mentioned Plustek -- is this promising?).

OK, it's certainly worth a shot. I don't know about Plustek either,
though.

Jesse> But, even supposing that the driver is not supported,
Jesse> shouldn't saned find the scanner? Or are my intuitions
Jesse> wrong?

No, saned finds only what the other programs find. But it won't
_tell_ you what it finds, so it's not the best choice for debugging
things.

Jesse> Here's what I get from scanimage:
Jesse> root:/home/jesse$ scanimage
Jesse> scanimage: sane_start: Invalid argument

Here is what's going on: if you do "scanimage -L" you'll see the list
of available devices. You'll probably see pnm:0 and pnm:1 only. By
default, scanimage opens the first available device. In your case,
pnm:0. By default, pnm:0 attempts to read /tmp/input.ppm and since
you probably don't have such a file, the scan fails with "Invalid
argument".

Jesse> Or else: root:/home/jesse$ scanimage -d /dev/sga
Jesse> scanimage: open of device /dev/sga failed

/dev/sga is not a valid device name in the default configuration. See
sane-dll(5) for some details, but briefly, you'd use:

mustek:/dev/sga
or
umax:/dev/sga
or
hp:/dev/sga

depending on the driver you want to use.

--david

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