Bug 426045 - global scaling or dual-head display causes paint problems
Summary: global scaling or dual-head display causes paint problems
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: general (other bugs)
Version First Reported In: unspecified
Platform: Ubuntu Linux
: NOR major
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2020-09-01 02:55 UTC by Wim Delvaux
Modified: 2024-04-25 13:47 UTC (History)
2 users (show)

See Also:
Latest Commit:
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virtual box display problem (1.42 MB, image/png)
2020-09-01 02:55 UTC, Wim Delvaux 		Details
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Description Wim Delvaux 2020-09-01 02:55:15 UTC 
Created attachment 131334 [details]
virtual box display problem

SUMMARY

I have a dual display setup with monitors of different resolution.
I have global scaling enabled and set to 175 %

when I start some applications like vlc, virtualbox, dragonplayer, kate the content of the application is not drawn properly and the content of the window (menus button etc) is unusable/unreactive.  Resizing the window does not refresh the window (see ttached screenshot of virtualbox

now when I disable one screen OR set the global scaling to 100 % the paint problems go away.

when I mess with the backend renderer the problem does not go away.

setting the scaling to 100% and using the fonts to scale is a workaround but it does not increase the size of visual elements like scrollbars which remain rather small.

KDE Frameworks 5.68.0
Qt 5.12.8 (built against 5.12.8)
The xcb windowing system
Comment 1 David Redondo 2024-04-25 13:47:18 UTC 
Since the time this bug has been filed there have been many scaling fixes in KWin and Qt.This should be fixed now. Please reopen if otherwise