[kde] [Bug 464024] New: KDE stopped working with multiple monitors

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=464024

            Bug ID: 464024
           Summary: KDE stopped working with multiple monitors
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: brian at fodvo.org
  Target Milestone: ---

SUMMARY
***
On Fedora 37, recent updates (around Christmas) have made KDE stop working with
multiple monitors.  The PC will boot with both monitors working, but when KDE
starts after the GDM login, the second monitor will quickly go dark and power
down.  Attempts to use the Display Configuration fail.  It sees the second
monitor, but its not enabled and attempts to re-enable it always fail to
activate the monitor, and eventually the enabled button turns off again.  

If I launch GNOME, the second monitor is working fine, if I turn off the
primary monitor and make the second primary, it works fine.  So its not the
cabling or faulty monitor.

Sometimes, after playing with trying to enable the monitor the config tool will
crash (https://bugs.kde.org/show_bug.cgi?id=462653)
This is likely related but I don't know if its the root cause.

I've waited for a couple weeks hoping a new Fedora DNF upgrade will fix the
problem, but multiple updates have not so far.
***


STEPS TO REPRODUCE
1.   Enable secondary monitor
2. 
3. 

OBSERVED RESULT
Secondary monitor stays dark, no signal to the screen.

EXPECTED RESULT
It should extend the desktop to both monitors

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  5.26.5
(available in About System)
KDE Plasma Version:  5.26.5
KDE Frameworks Version:  5.101.0
Qt Version:  5.15.7

ADDITIONAL INFORMATION (from About System)
Operating System: Fedora Linux 37
KDE Plasma Version: 5.26.5
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Kernel Version: 6.0.17-300.fc37.x86_64 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700K CPU @ 4.00GHz
Memory: 31.3 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1080/PCIe/SSE2
Manufacturer: Gigabyte Technology Co., Ltd.

Both monitors hooked up with DisplayPort cables to single Nvidia 1080.

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