Bug 474341 - Window height does not scale properly in fractional scaling wayland multi-monitor setup
Summary: Window height does not scale properly in fractional scaling wayland multi-mon...
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: wayland-generic (show other bugs)
Version: unspecified
Platform: Arch Linux Linux
: NOR minor
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: multiscreen
Depends on:
Blocks:
 
Reported: 2023-09-09 15:52 UTC by Joao Kdouk
Modified: 2023-09-12 17:33 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed In: 6.0
Sentry Crash Report:

Attachments
Problem Screenshot (136.31 KB, image/png)
2023-09-09 15:52 UTC, Joao Kdouk 		Details
Display Settings (261.67 KB, image/png)
2023-09-11 21:15 UTC, Joao Kdouk 		Details
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Description Joao Kdouk 2023-09-09 15:52:56 UTC 
Created attachment 161526 [details]
Problem Screenshot

SUMMARY
Programs do not go full height (maximized) in the primary monitor when the secondary monitor uses Wayland fractional scaling. 


STEPS TO REPRODUCE
1. Plug in a secondary monitor and set it to 125% scaling on Wayland.
2. Open Firefox on the primary monitor, without fractional scaling (on the primary monitor)
3. Try to maximize the browser window.

OBSERVED RESULT
You will see that it does not cover the full height of the window, being limited to the fractional scaling of the second window, no matter what you do. An attachment has been added showing how the screen looks. I have Firefox (first window from top to bottom of the attached image), then Visual Studio Code in the back, and finally my bottom application panel.

EXPECTED RESULT
It should cover the full height of the screen. See the difference between Visual Studio Code and Firefox in the attached picture.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.27.7-2
KDE Plasma Version: 5.27.7-2
KDE Frameworks Version: 5.109.0-1
Qt Version: 5.15.10
Comment 1 Joao Kdouk 2023-09-09 15:59:53 UTC 
Small comment here. It looks like the problem is in fact if the secondary monitor has a bottom panel. Changing its height also changes the gap between the primary monitor window and bottom panel.
Comment 2 Joao Kdouk 2023-09-09 16:02:30 UTC 
One more comment here, just noticed it has to do with an offset between the two monitor. If the bottom of the two displays is not aligned in the settings, then the gap will be experienced. I have been able to fix it but just align the bottom of the two display, but I will keep the ticket open for now, perhaps this can be easily fixed in a future release of KDE Plasma.
Comment 3 Nate Graham 2023-09-11 21:13:05 UTC 
Can you attach a screenshot that shows your settings on the Display Configuration page in System Settings?
Comment 4 Joao Kdouk 2023-09-11 21:15:31 UTC 
Created attachment 161566 [details]
Display Settings
Comment 5 Joao Kdouk 2023-09-11 21:16:24 UTC 
Added another screenshot with the display settings alongside the problem. In this case, firefox does not fully maximize, and we can clearly see VSCode maximized in the back.
Comment 6 Nate Graham 2023-09-12 17:33:30 UTC 
Cannot reproduce with those exact settings in Plasma 6, so it looks like it's been fixed there!