Re: [PATCH] Fix re: Mustek Scan Express 12000SP Problems

Dr. Andreas Bolsch (a.bolsch@ic.ac.uk)
Mon, 01 Jun 1998 14:14:14 +0200

I'm afraid the problem with the ScanExpress is not caused that way.
It utilizes a completely different command set, and the gamma tables
are only send once (in grayscale mode only the gray one, in color
mode only the red, green, blue).

Furthermore I've experienced that this problem does *not* occur
with my ScanExpress 12000SP if at most 2 read_data commands are
queued (even with 600 * 1200 dpi ^2). However, this way scanning
becomes incredible slow. (the scanner has only 128kB internal buffer)
The only cure I'know at the moment would be increasing the max.
request size from 127kB to 2MB, say.

But I don't know whether this is possible with the Linux sg.
Any kernel hacker around?

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