eGalax touchscreen and RandR rotation

Sandeep sandy.8925 at
Sun Oct 20 13:57:05 PDT 2013

Ok, I was wrong. Looked at Xorg logs, and it shows that the
/dev/input/mouse* devices that correspond to the touchscreen are not picked
up by any of the existing configurations in xorg.conf.d

On Thu, Oct 10, 2013 at 11:48 PM, Sandeep <sandy.8925 at> wrote:

> I think I figured out what's wrong.
> udev creates two input devices for the touchscreen:
> - Touch input
> - Mouse input
> I guess this is done to emulate the touchscreen as a mouse so that it can
> be used with existing GUI's without requiring applications to handle touch
> input.
> Mouse input is configured to be relative by default, touch input is
> configured to be absolute by default.
> The video shows that the touchscreen input is also translated as mouse
> input which is relative, so the mouse pointer moves accordingly. The touch
> input itself is invisible, and it looks like no application is using it,
> and the only visible change is in the mouse pointer.
> The solution then seems to be that the mouse input created for the
> touchscreen should be configured as an absolute device, which will then
> make it work correctly.
> -Sandeep
> On Fri, Oct 4, 2013 at 5:36 PM, Sandeep <sandy.8925 at> wrote:
>> Hi,
>> I have an Acer Iconia Tab W500. It has an eGalax touchscreen. Single
>> touch input  works.
>> I mainly use KDE, and when I rotate the screen using the Krandrtray
>> application, the mouse input works fine, but the touchscreen input does not
>> work correctly.
>> Here is a video showing the problem:
>> It looks like the touch driver rotates the input in the same way that the
>> screen is rotated, thus producing wrong/unexpected behaviour.
>> I tried searching for existing bugs at and it
>> doesn't look like any of them cover this problem. Does anyone know what the
>> problem might be, and how I can figure out where the problem lies?
>> Thanks,
>> Sandeep
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