Bug 495665

Summary: After logging in with Wayland, in a few seconds Plasma will turn the monitor off and lose the signal, monitor will keep turning on and off
Product: [Plasma] plasmashell Reporter: blumoopjapalt
Component: Startup processAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED DUPLICATE    
Severity: major CC: kde, nate
Priority: NOR    
Version: git-stable-Plasma/6.2   
Target Milestone: 1.0   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description blumoopjapalt 2024-11-01 02:35:19 UTC
SUMMARY
After doing a fresh install of Aurora, I logged in with SDDM and get to the Plasma GUI. Unfortately after a few seconds my monitor will turn off suddenly, and then will try to cycle through the Samsung and Odyssey logo, failing to find the DisplayPort signal. This is with Wayland, which is the default for Fedora KDE now, so I can't use x11 to fix the issue anyways. I have a Intel Arc A770 hooked with a DisplayPort to a Samsung Odyssey G5 monitor. I can't get back to Aurora and have to long press the power button to turn off. 

STEPS TO REPRODUCE
1. Fresh install Aurora:stable and try to log in.
2. You will be in the Plasma GUI before monitor shuts off
3. Monitor will cycle through the logos and try to find the singal, but can't.

OBSERVED RESULT
It seems that something is wrong with my monitor, Wayland, and Plasma not working together, as I can't seem to find anyone else with this exact problem. 

EXPECTED RESULT
Plasma should not be turning the monitor off after logging in with SDDM.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Aurora 40 (ublue Fedora)
KDE Plasma Version: 6.2.2
KDE Frameworks Version: 6.7.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION
Same issue also happens on EndeavourOS, but switching to x11 the issue doesn't happen, and on Solus, the monitor will turn off and turn back on once before I get to the Plasma GUI and can use it normally with Wayland, although I don't know if Solus KDE is the same versions as Fedora.
Comment 1 blumoopjapalt 2024-11-01 13:25:05 UTC
I have found a workaround for this issue. If your monitor happens to have a feature for automatically switching output depending on which connected device turns on, turn it off. This fixes the issue for me until this can be fixed from the Plasma side.
Comment 2 blumoopjapalt 2024-11-01 13:47:51 UTC
(In reply to blumoopjapalt from comment #1)
This only seems to work on EndeavourOS, the issue is still happening on Aurora and Fedora KDE.
Comment 3 Nate Graham 2024-11-01 14:58:24 UTC

*** This bug has been marked as a duplicate of bug 494522 ***