https://bugs.kde.org/show_bug.cgi?id=511940

            Bug ID: 511940
           Summary: Plasma6  x11  session can not load desktop (black
                    screen) when the screen resolution is 5k (5120x2880)
    Classification: Plasma
           Product: plasmashell
      Version First 6.5.1
       Reported In:
          Platform: openSUSE
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: "Manage Desktop and Panels" window
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: 1.0

Created attachment 186685
  --> https://bugs.kde.org/attachment.cgi?id=186685&action=edit
black screen with screen edge serched app running

SUMMARY
Chose the x11 session and enter the password on sddm screen(sddm screen showed
correctly 5k resolution),the plasma6 x11 session starting to load, then got a
black screen with a mouse cursor, but the screen edges working (can serch app
to run).
But, if there is a screen (or just edid) that with 4k resolution preferred and
5k resolution max, the desktop would be loaded just fine, and then 5k
resolution will also working.

STEPS TO REPRODUCE
1. Install the NVIDIA driver and plug a 5k resolution screen;
2. Chose plasma6 x11 session, enter the login password;

OBSERVED RESULT
The desktop can not load currectly, black screen with mouse cursor and screen
edges.

EXPECTED RESULT
Load the x11 desktop session currectly.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma:  openSUSE Tumbleweed
KDE Plasma Version: 6.5.1
KDE Frameworks Version: 6.19.0
Qt Version: 6.10.0

ADDITIONAL INFORMATION
Hardware:
AMD 5950x/ASUS x570e/NVIDIA RTX 3070/Apple studiodisplay;
AMD 9900x/MSI x870e/NVIDIA RTX 5060/Apple studiodisplay;
Tested with same results.

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