xinput -> core pointer - Transformation?

Roman Seidl roman at
Thu Oct 13 04:51:26 PDT 2011

Thnaks for answering my request. Well it does not seem to be a Problem 
with Xournal - it ist the same with the current stable and the 
development version. Furthermore it ist the same problem with GIMP when 
i activate the Xinput.

So is there any information onf how the pointer gets transformed?

best regards

Am 2011-09-30 07:20, schrieb Peter Hutterer:
> On Wed, Sep 28, 2011 at 11:36:41PM +0200, roman wrote:
>> Hi!
>> I have a tablet and i want to use an external monitor that covers
>> just a part of the screen. This is no problem concering xrandr as i
>> can set a scale and a position.
>> The problem is with the pen. The pen core pointer is automatically
>> postioned the right way - even in this situation. But no
>> transformation matrix whatsoever is set in the xinput settings for
>> the device.
>> Sounds nice BUT I want to use direct xinput for using xournal.
>> So i would like to modify the Transformation matrix. If i do so the
>> xinput can be set to be in line with the monitors - but then the
>> core pointer is wrong.
>> How is the xinput transformed into postions on screen for the core pointer?
>> Is there any way to get infos on the transformation that takes place?
>> Is it possible to modify it?
> I don't quite understand. Changing the device matrix should also change the
> XI coordinates and map them into the same range. What isn't working here?
> Does xournal scale somehow differently again?
> Cheers,
>    Peter

mail   roman at
tel    +43-650-2041643
jabber rot at

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