[sane-devel] rts8891: Umax Astra 4450 does not work

Ondrej Zary linux at rainbow-software.org
Fri May 8 19:46:36 UTC 2015

On Friday 08 May 2015 16:17:53 Ondrej Zary wrote:
> On Thursday 07 May 2015 23:32:28 Ondrej Zary wrote:
> > Hello,
> > I just got Umax Astra 4450 (same as 4400 except with UTA?) for a while
> > and tested it with SANE. Unfortunately, it does not work. The lamp turns
> > on and the head moves a bit, then goes back (two times) and the scan ends
> > with these errors:
> >
> > [rts8891] simple_scan: failed to wait for data
> > [rts8891] gain_calibration: failed scan data
> > [rts8891] sane_start: failed to do gain calibration!
> > scanimage: sane_start: Error during device I/O
> I've modified sane_start() in rts8891.c to not fail if gain_calibration()
> returns error. It now scans the complete area and the output resembles
> what's in the scanner (black template for UTA use with green text) but it's
> blurry, shifted horizontally (and the gain is wrong, of course):
> http://www.rainbow-software.org/linux_files/umax_astra_4450/no_gain_calibra
> http://www.rainbow-software.org/linux_files/umax_astra_4450/no_gain_calibra
> Looks like there's a problem with the sensor type?

Created a simple parser for the usbsnoop dumps and uploaded it along with 
parsed files:


umax-vistascan-run seems to be a subset of umax-plug

Ondrej Zary

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