https://bugs.kde.org/show_bug.cgi?id=474110
Bug ID: 474110
Summary: Touchscreen calibration matrix NOT respected (Xorg)
Classification: Plasma
Product: kwin
Version: 5.27.7
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: dofficialg...@gmail.com
Target Milestone: ---
SUMMARY
Touchscreen calibration matrix is NOT respected on xorg via any of the
permanent methods available to set one.
The proper method for setting a calibration matrix is trhough a UDEV rule
settting the ENV variable `LIBINPUT_CALIBRATION_MATRIX`. The variable can be
set and it is seen to have been applied when observing the props (eg: "xinput
list-props nameoftouchscreen" will have a value "libinput Calibration Matrix
Default" that matches what is set in the UDEV rule). This calibration matrix is
NOT respected by the DE and has NO affect. I can set it to whatever values and
there is no change at all.
The alternative option is setting the `Coordinate Transformation Matrix`
through XORG which can be done temporarily with `xinput set-prop
nameoftouchscreen "matrix goes here"`, however this is NOT permanent and gets
reset any time the display gets rotated with xrandr (so via the xrandr command
line tool or system settings). The official way to set that is via a xorg conf
file
```
Section "InputClass"
Identifier "calibration"
MatchProduct "nameoftouchscreen"
Option "TransformationMatrix" "0 1 0 -1 0 1 0 0 1"
EndSection
```
but this has no affect and on boot and any rotation the `Coordinate
Transformation Matrix` always shows the identity matrix.
This functionality is very important for devices where default touchscreen
orientation does not match the default display orientation.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Ubuntu
KDE Plasma Version: 5.27.7
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10
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