Created attachment 167488 [details]
qdbus org.kde.KWin /KWin supportInformation

SUMMARY
I have a four-monitor setup. All monitors have different resolutions and are connected to an AMD RX580.
Sometimes, after waking up the system after a suspend event, one or two monitors don't wake up. This issue never happened to me before upgradeing to Plasma 6.0.0. I'm running on X11.

STEPS TO REPRODUCE
1. Suspend the system via systemctl suspend or by clicking "sleep" in kickoff
2. wait some time
3. wake up the system

OBSERVED RESULT
One or two monitors, approximatly 50% of the time, don't wake up. The monitors that don't wake up are always the same, one connected via an HDMI-DVI adapter and the other via an HDMI one. The other two monitors, hooked up via HDMI and DP always wake up without issues.

EXPECTED RESULT
All monitors wake up.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Linux 39
KDE Plasma Version:  6.0.2
KDE Frameworks Version:  6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION

xrandr output after waking up and one monitor off (HDMI-A-1):
Screen 0: minimum 320 x 200, current 4480 x 2284, maximum 16384 x 16384
DisplayPort-0 connected primary 2560x1440+1920+844 (normal left inverted right x axis y axis) 597mm x 336mm
2560x1440     59.95*+  74.97    72.00    60.02    50.01    48.00
1920x1200     59.95
1920x1080     74.97    60.00    50.00    59.94
1600x1200     59.95
1280x1440     59.91
1680x1050     59.95
1280x1024     75.02    60.02
1440x900      59.89
1280x960      60.00
1280x800      59.95
1280x720      60.00    50.00    59.94
1024x768      75.03    70.07    60.00
832x624       74.55
800x600       72.19    75.00    60.32    56.25
720x576       50.00
720x480       60.00    59.94
640x480       75.00    72.81    66.67    60.00    59.94
720x400       70.08
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected 1280x1024+640+0 inverted (normal left inverted right x axis y axis) 338mm x 270mm
1280x1024     60.02*+  75.02
1280x800      60.02
1152x864      75.00
1280x720      60.02
1024x768      75.03    70.07    60.00
832x624       74.55
800x600       72.19    75.00    60.32    56.25
640x480       75.00    72.81    66.67    59.94
720x400       70.08
HDMI-A-1 connected (normal left inverted right x axis y axis)
1920x1080     60.00 +  50.00    50.00    59.94
1680x1050     59.88
1600x900      60.00
1280x1024     60.02
1440x900      59.90
1280x800      59.91
1280x720      60.00    50.00    59.94
1024x768      60.00
800x600       60.32
720x576       50.00
720x480       60.00    59.94
640x480       60.00    59.94
DVI-D-0 connected 1920x1080+0+1024 (normal left inverted right x axis y axis) 510mm x 290mm
1920x1080     60.00*+
1680x1050     59.88
1280x1024     60.02
1440x900      60.00
1280x960      60.00
1280x800      60.00
1152x864      59.97
1280x720      60.00
1024x768      60.00
800x600       60.32
640x480       59.94

Have to wake up the monitor via "xrandr --output HDMI-A-1 --auto" and subsequently rearrange the disposition with kscreen kcm.