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I've got a NVidia GTX260 card with one regular screen above one touchscreen using the eGalax driver.

I've tried to configure the touchscreen using xinput but I can't get it right. With the normal screen disconnected and fiddling with the "Evdev Axis Calibration" option it works fine, but when I hook up the normal screen again the tough mapping is shifted. If I touch the touchscreen the mouse moves to the corresponding position on the other screen.

Neither "Coordinate Transformation Matrix" nor "map-to-output" seems to work...

Any help is greatly appreciated!

/Henrik

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Not an answer, but a question for Beni. This seems to be going in the right direction to fix my problem as well. However, I don't believe that I am using the correct <touch input device> info for step 2. How can I determine precisely what to put in the <touch input device> brackets? Great post BTW –  user164769 Jun 5 '13 at 21:00
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2 Answers

for me with Ubuntu 12.04 LTS (64bit) it didn't wort until i saw in the xinput --help that the right command is

xinput map-to-crtc 'Name of input device' Name of output device

while Name of input device is shown by $xinput --list, name of output device is shown be $xrandr and could be LVDS1 oder VGA1 e.g.

best regards mEon

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This is a great answer, but where do you put this command so that it get's executed on startup. I've tried in /etc/lightdm/lightdm.conf but that locks up the entire computer (had to recover via recovery mode) and I've tried in in /etc/rc.local but the command doesn't execute. –  Damiön la Bagh Jan 16 at 13:33
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I now (on 13.04) had a similar problem but xinput map-to-output did help, if I do things in the right order.

xinput map-to-output tweaks the "Coordinate Transformation Matrix".
xinput_calibrator sets "Evdev Axis Calibration" and is completely unaware of "Coordinate Transformation Matrix". It also always opens stretched to the full available output area.

This means that you must run xinput_calibrator on a single screen.

  1. xrandr --output <non-touch-output> --off

  2. xinput map-to-output <touch input device> <touch-output>
    (to reset "Coordinate Transformation Matrix" in case you've touched it before).

  3. Calibrate with xinput_calibrator.
    You should now have well-calibrated touch on the single screen.
    (My touchscreen was initially way off — X/Y swapped, Y inverted — so I had to run this twice, with --misclick 0. I believe that's a property of my touchscreen, unrelated to the dual monitor situation.)

  4. Re-enable the second screen.
    xrandr --output <non-touch-output> --on

  5. Do map-to-output again.

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