Touchscreen ABS_X, ABS_Y events ignored by Xorg evdev driver in Ubuntu?

[Peter Hutterer]

On Mon, Oct 26, 2015 at 09:11:40AM +0200, Teemu Rinta-aho wrote:
> Hi all,
> 
> I am trying to get a touch screen (GMK) working with Xorg 1.15.1
> running on Ubuntu 14.04.
> 
> I can get the display work as a touch pad using Xorg mouse driver with
> /dev/input/mouse0, but when I try to use the 'evdev' driver and
> /dev/input/event*, I can only get the button pressed and released events to
> X, i.e. the pointer is not moving anywhere.
> 
> I can run evtest to see that there are ABS_X and ABS_Y events coming from
> the device with correct coordinates, but somehow these are not used by Xorg.
> I think I have tried all possible evdev options in Xorg configs.
> 
> I would appreciate any insights on how to debug this further, or better
> yet, a solution to fix the problem. I can provide more information if
> needed. Thanks.
> 
> Here are some screenshots from the system giving some information:

fwiw, text attachments would be a lot easier ;)

not quite enough information to gather from this though, I'd say check with
a vanilla upstream version of the driver to make sure it's not a
ubuntu-specific patch that interferes. If it doesn't work with upstream
either, please file a bug and attach the evemu-record output (as text file).

Cheers,
   Peter

> 
> evtest output:
> https://drive.google.com/file/d/0B432-jkCZeXgakQ0WXZ1MGZ5dXM/view?usp=sharing
> 
> mtdev-test output:
> https://drive.google.com/file/d/0B432-jkCZeXgTWxiNElkdzZOdVE/view?usp=sharing
> 
> xinput list:
> https://drive.google.com/file/d/0B432-jkCZeXgSjJlZjBjakM1ZmM/view?usp=sharing
> 
> xinput props:
> https://drive.google.com/file/d/0B432-jkCZeXgQUI5NXRONzdrWGc/view?usp=sharing
> 
> xinput test:
> https://drive.google.com/file/d/0B432-jkCZeXgeDV0Yno3c2tMMkU/view?usp=sharing
> 
> xorg.log:
> https://drive.google.com/file/d/0B432-jkCZeXgaVVCVWdaeS12Njg/view?usp=sharing
> 
> BR,
> Teemu Rinta-aho