Bug 475135

Summary:	New external monitor has bad initial resolution/mode
Product:	[Plasma] kwin	Reporter:	Nicolas Fella <nicolas.fella>
Component:	multi-screen	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED FIXED
Severity:	major	CC:	nate, xaver.hugl
Priority:	NOR	Keywords:	multiscreen, qt6, wayland-only
Version First Reported In:	master
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Nicolas Fella 2023-10-02 15:31:08 UTC

STEPS TO REPRODUCE
1. Clear kscreen config
2. Plug in external monitor via HDMI

OBSERVED RESULT
Monitor works, but it's using 1024x768 resolution. This is not only way below what the monitor is capable (3840x2160) but also is 4:3 instead of the monitor's native 16:9. This results in a very poor and distorted image. 

EXPECTED RESULT
An appropriate resolution is chosen, i.e. the highest available or at least one that matches the monitor's aspect ratio

SOFTWARE/OS VERSIONS
KDE Plasma Version: master, kwin fdb75aeec80e8cad270f594b8424590d23b83f54
KDE Frameworks Version: master
Qt Version: 6.6

ADDITIONAL INFORMATION
Follow-up from https://bugs.kde.org/show_bug.cgi?id=474915

Comment 1 Zamundaaa 2023-10-04 18:08:29 UTC

Does this also happen if you disable KScreen? Because I ran your modelist through the algorithm used in KWin and the 2560x1440@59.95 mode gets chosen.

Comment 2 Nicolas Fella 2023-10-04 18:18:57 UTC

Same thing after disabling the kscreen kded module

Comment 3 Nate Graham 2023-12-15 05:34:04 UTC

Are you still able to reproduce this? I haven't been able to myself.

Comment 4 Zamundaaa 2024-01-24 21:35:25 UTC

ping

Comment 5 Nicolas Fella 2024-01-24 21:45:15 UTC

It seems to work as expected now. The highest resolution is picked