Bug 500787

Summary:	Replica of screen after sleep mode
Product:	[Plasma] KScreen	Reporter:	Paul Chaffey <paul.chaffey>
Component:	common	Assignee:	kscreen-bugs-null <kscreen-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	nate
Priority:	NOR	Keywords:	multiscreen
Version First Reported In:	6.3.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Paul Chaffey 2025-02-26 20:29:11 UTC

Hi, my setup is as follows:

I have a large modern LG curved massive 21:9 gaming monitor which is the main display. This is connected via my AMD graphics card using DP. On the same card I am running the HDMI output to an Onkyo AV receiver for the surround sound. So, the Onkyo is detected as a second display which I have setup as a replica of the LG display (even though it has no hope of meeting the same display settings as the LG).

This surprisingly works very well until my machine goes into deep sleep mode. When I start the machine again it seems to have the max display format for things like netflix and youtube full screen as the Onkyo display and not the DP LG display.

I'm not completely certain if this is KDE screens fault or something underlying this. I run everything via wayland.

Any testing I can do to help narrow down, let me know. Cheers, Paul.

Comment 1 Nate Graham 2025-02-27 00:23:57 UTC

Are you using the Wayland session?

Comment 2 Paul Chaffey 2025-02-27 08:03:48 UTC

Yes this is a wayland session

Comment 3 Paul Chaffey 2025-02-27 17:20:26 UTC

After some further digging, I have found that turning off replica, this problem disappears. Where I notice the second display is at login (using SDDM) where the smaller screen is overlayed on top of the primary. As SDDM i believe is not using wayland this should disappear over time as SDDM improves. I shall close the bug report and mark as resolved.