https://bugs.kde.org/show_bug.cgi?id=511962
Bug ID: 511962
Summary: UI clicks are offset from pen position (but cursor is
not) when using tablet and fractional scaling.
Painting is unaffected.
Classification: Applications
Product: krita
Version First 5.2.13
Reported In:
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Tablets (tablet issues are only very rarely bugs in
Krita!)
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
With fractional scaling disabled, both painting and UI actions work as expected
when using tablet input.
With fractional scaling in use, painting works as expected but UI clicks are
offset from the cursor position.
STEPS TO REPRODUCE
1. Use a tablet with pen input as the primary display. "Clicks" with the pen
work as expected in the OS UI.
2. In Ubuntu display settings, enable "Fractional Scaling" and set the scale to
133%.
3. Observe: pen "clicks" in the Ubuntu UI still work as expected.
4. Start Krita and create a new document. Maximize the window.
5. Select a brush and paint on the document. Observe: both the cursor and the
drawn line match the pen position.
6. Hover the pen over the brush selector. The cursor matches the pen position.
7. Tap a brush icon with the pen.
OBSERVED RESULT
The actual selected brush is offset to the right and below.
EXPECTED RESULT
The actual selected brush is the one directly under the pen.
SOFTWARE/OS VERSIONS
Ubuntu 25.10 (default DE)
Linux 6.17.0
ADDITIONAL INFORMATION
The tablet is the primary display of the Framework 12 laptop.
The pen is a Metapen M2 (MPP 2.0 protocol).
I suspect this has something to do with XWayland or Qt rather than Krita
directly.
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