Bug 497982

Summary:	Fractional scaling: mono apps don't scale anymore
Product:	[Plasma] kwin	Reporter:	Mark B <kde.ppvo2>
Component:	xwayland	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DOWNSTREAM
Severity:	normal	CC:	kde, xaver.hugl
Priority:	NOR
Version:	6.2.4
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Mark B 2024-12-28 13:38:00 UTC

SUMMARY
Mono application don't scale anymore in 4k with fractional scaling (it worked fine up to a few months earlier, so something broke it).


STEPS TO REPRODUCE
1. enable 150% scaling on 4k in display settings.
2. Start an app with mono ( i.ex run the gmkvextractgui exe with mono, available here: https://sourceforge.net/projects/gmkvextractgui/files/v2.7.0/ , or subtittleedit available here: https://github.com/SubtitleEdit/subtitleedit/releases , also in the AUR: https://aur.archlinux.org/packages/subtitleedit)

OBSERVED RESULT
You will see that the apps don't scale in 4k. (it worked a few months ago)

EXPECTED RESULT
The mono apps should scale  in 4k. (as they did before)


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: kernel 6.12
KDE Plasma Version: plasma 6.2.4
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.1

Comment 1 Zamundaaa 2024-12-28 15:36:31 UTC

Isn't this the same as bug 497984?

Comment 2 Mark B 2024-12-29 15:45:04 UTC

(In reply to Zamundaaa from comment #1)
> Isn't this the same as bug 497984?

No, they are 2 different problems, this is why I filed 2 different bugs.

This bug is about mono apps not scaling at all (with the system scaling or the individual per app scaling in the system display settings, it is the same -> does not scale at all).

Just run the 2 apps I have linked to with mono, and see for yourself.

As I said: it worked a few months ago, so something broke it.

Thanks.

Comment 3 David Edmundson 2025-01-02 15:06:50 UTC

Please report to Mono.