https://bugs.kde.org/show_bug.cgi?id=511835
Bug ID: 511835
Summary: Glitched state of tablet cursor location input
Classification: Applications
Product: systemsettings
Version First 6.3.6
Reported In:
Platform: NixOS
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_tablet
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
Hello,
Thank you for looking into this.
SUMMARY
I can reproduce a glitched state for my tablet hid device that essentially
makes further cursor inputs impossible. It seems like it freezes, but the
tablet is actually still working with all features except for cursor location.
I'm not sure where this bug is originating from, as it didn't throw any error
messages, and I don't know how to isolate it further.
I can give you some hints on why I think the actual problem is a glitched
state.
1. When I reconnect the tablet, and it receives a new USB bus ID the glitched
state is cleared, but when I do a power cycle using usbreset or usbctl -a cycle
the Issue is still there as the device ID didn't change.
2. When producing the glitch, all other device interactions work normal, only
pen interactions are seemingly gone.
STEPS TO REPRODUCE
src: I used the Wacom Intuos Draw, but it might work with any tablet.
1. Set the mapped area to a very small region. I have it set to 26%x22%
2. Flick the pen over the area to accelerate the cursor towards the edge of the
screen. It might take a few tries.
OBSERVED RESULT
The Tablet pen is unresponsive until the hid device is reinitialized with a new
USB bus/device port (not actual other physical USB port)
EXPECTED RESULT
The Cursor location should stay absolute to tablet coordinates. When cursor
location or other metric overflows or enters some other kind of glitched state,
the pen should be reinitialized.
SOFTWARE/OS VERSIONS
Operating System: NixOS 25.05
KDE Plasma Version: 6.3.6
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.3
Kernel Version: 6.12.56 (64-bit)
Graphics Platform: Wayland
Processors: 16 × Intel® Core™ i9-9900K CPU @ 3.60GHz
Memory: 62.7 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 2080 Ti
ADDITIONAL INFORMATION
I guess my workaround is to not drop the pen on my tablet when I want to type
something. I can give more detailed instructions if needed, but I think this
should suffice.
The whole ordeal gives me a strong feeling the issue lies within kwin input
handling.
I did a lot of testing and fiddling around. If you have any questions, You
might remind me of Information I accidentally omitted here.
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