Issue:
Multi Monitor system A: [2560x1440@144Hz], B: [3840x2160@240Hz], C: [3840x2160@144Hz] all connected via DisplayPort. Monitor B is: Samsung 32 Odyssey OLED G80SH, QD-OLED. Monitor B is brand new. My old configuration was A, C, A.
I dont sleep my computer if I step away, I just leave it and let the monitor turn off after 5 minutes (via the KDE power management setting). After the monitors have been off for 5 minutes and the PC wakes the monitors back up [1], B remains “active/connected” but renders nothing (just a black screen). I can login and see my desktop on monitors A, C. The KDE desktop still “sees” monitor B but still doesn’t render anything.
[1]: When I move my mouse to wake my PC I hear the connect / disconnect device sound play.
This happens when the monitor is set to run on 119Hz as well as 240Hz.
Workarounds:
- Right click desktop and go to Display Configuration (or find it in KDE System Settings)
- Click on monitor B in the arrangement view
- Change refresh rate from 240Hz → 119Hz
- Click Apply
- Monitor B turns back on
- The `Keep display configuration` dialog will display, click Revert (to go back to 240Hz)
- Monitor B still on
- Good to go until monitor turns off via settings again.
- Restarting / Shutdown PC
KDE Power Management settings:
- Suspend Session -
When inactive: Do nothing
When power button pressed: Show logout screen
- Display and Brightness -
Dim automatically: Never
Turn off screen: 5 minutes When locked: 1 minute
Change keyboard brightness: N/A
- Other Settings -
Switch to power profile: Leave unchanged
When inactive: Run after 10 minutes
Command script file: N/A
System Specs:
Operating System: Fedora Linux 44
KDE Plasma Version: 6.7.5
KDE Frameworks Version: 6.30.0
Qt Version: 6.11.2
Kernel Version: 7.2.7-200.fc44.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 32 × 13th Gen Intel® Core™ i9-13900K
Memory: 64 GiB of RAM (62.6 GiB usable)
Graphics Processor: NVIDIA GeForce RTX 5080
Manufacturer: ASRock
Product Name: Z790 Pro RS
NVIDIA-SMI 615.71.09