Bug 461208 - Fractional scale and Mesa Intel give artefacts on X11
Summary: Fractional scale and Mesa Intel give artefacts on X11
Status: REPORTED
Alias: None
Product: kwin
Classification: Plasma
Component: general (show other bugs)
Version: unspecified
Platform: Manjaro Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: X11-only
Depends on:
Blocks:
 
Reported: 2022-10-30 15:26 UTC by evgeniyharchenko.dev
Modified: 2025-02-24 17:58 UTC (History)
1 user (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Display settings rendered on Intel (48.01 KB, image/png)
2022-10-30 15:30 UTC, evgeniyharchenko.dev 		Details
Bluetooth settings rendered on Intel (14.21 KB, image/png)
2022-10-30 15:31 UTC, evgeniyharchenko.dev 		Details
KIO rendered on Intel (80.04 KB, image/png)
2022-10-30 15:32 UTC, evgeniyharchenko.dev 		Details
Display settings rendered on Nvidia (45.81 KB, image/png)
2022-10-30 15:33 UTC, evgeniyharchenko.dev 		Details
Bluetooth settings rendered on Nvidia (13.60 KB, image/png)
2022-10-30 15:33 UTC, evgeniyharchenko.dev 		Details
View All Add an attachment

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Description evgeniyharchenko.dev 2022-10-30 15:26:56 UTC 
SUMMARY
There are graphical issues (artefacts?) in some apps when global scale is not multiple of 100 (e.g. 125%). Buggy apps look better if launched with Nvidia card. The problem is clearly not with the display. External monitor has the same problem. There is no problem on Wayland session.


STEPS TO REPRODUCE
1. Set global scale to 125%
2. Open Displays in System Settings
3. Look at resolution, frequency, scale options (value cells).

OBSERVED RESULT
Properly rendered UI elements (dropdown and spin boxes) with smooth lines and clear characters.

EXPECTED RESULT
Jagged UI elements lines and pixelated characters.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.15.74-3-MANJARO
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
Graphics platform: X11

ADDITIONAL INFORMATION
Mesa Intel HD Graphics 4600 (HSW GT2) v: 4.6 Mesa 22.1.7
Comment 1 evgeniyharchenko.dev 2022-10-30 15:30:09 UTC 
Created attachment 153329 [details]
Display settings rendered on Intel
Comment 2 evgeniyharchenko.dev 2022-10-30 15:31:01 UTC 
Created attachment 153330 [details]
Bluetooth settings rendered on Intel
Comment 3 evgeniyharchenko.dev 2022-10-30 15:32:30 UTC 
Created attachment 153331 [details]
KIO rendered on Intel
Comment 4 evgeniyharchenko.dev 2022-10-30 15:33:20 UTC 
Created attachment 153332 [details]
Display settings rendered on Nvidia
Comment 5 evgeniyharchenko.dev 2022-10-30 15:33:50 UTC 
Created attachment 153333 [details]
Bluetooth settings rendered on Nvidia
Comment 6 TraceyC 2025-02-24 17:58:43 UTC 
Adding the x11-only keyword