https://bugs.kde.org/show_bug.cgi?id=501305
Bug ID: 501305
Summary: Tablet calibration doesn't work properly with some
graphics tablets not supported by Linux Wacom driver
and can mess up the mapping
Classification: Applications
Product: systemsettings
Version: 6.3.2
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_tablet
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
SUMMARY
Tablet calibration doesn't work properly with some graphics tablets that are
using proprietary user-space drivers and are not supported by Linux Wacom
(Veikk A30 tablet in my case).
First of all I can't see the pointer when calibrating, and it seems that the
screen mapping in the calibration window is incorrect to begin with because I'm
not able to tap the second target and the following ones (this happens in this
window only, I don't really need calibration because it's already good by
default, I just wanted to try this feature).
The first time I tried it I touched the upper left corner of the tablet screen
but couldn't proceed with the calibration, so I hit "Cancel". And yet the
calibration got misconfigured and I couldn't use my tablet on Wayland.
Why isn't there a "reset to defaults" option? I tried clicking on "Defaults"
but nothing changed, still misconfigured.
I had to delete the tablet configuration in ~/.config/kcminputrc to reset it
correctly. The calibration matrix was full of "Nan".
STEPS TO REPRODUCE
1. Connect a graphics tablet like Veikk's (not supported by Linux Wacom) and
make sure that the proprietary user-space driver is installed and no other
kernel-space drivers compatible with the tablet are installed or active (like
OpenTabletDriver).
2. In Drawing Tablet settings click on the pen tab and then "Calibrate".
3. Try to follow the instructions for calibration and press "Cancel" if you're
not able to proceed.
OBSERVED RESULT
Can't calibrate correctly, the mapping gets messed up making the tablet
unusable. Can't reset the calibration from the settings.
EXPECTED RESULT
If I press on "Cancel" it shouldn't mess up with the default mapping. If the
tablet is not supported, the calibrate option shouldn't affect its default
mapping in any way instead of messing it up.
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 6.3.2
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.12.17-1-MANJARO (64-bit)
Graphics Platform: Wayland
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