https://bugs.kde.org/show_bug.cgi?id=485403

            Bug ID: 485403
           Summary: Enabling HDR freezes system
    Classification: Plasma
           Product: kwin
           Version: 6.0.3
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: wayland-generic
          Assignee: kwin-bugs-n...@kde.org
          Reporter: kde.backboned...@aleeas.com
  Target Milestone: ---

SUMMARY

 I clicked ‘enable HDR’ on one of my monitors and something broke. The whole
system froze up and the HDR monitor went black. If I reboot it freezes right
after I login.

If I unplug that monitor or start in X11 instead of Wayland then everything is
fine. Plugging the HDR monitor in while I’m logged into a Wayland session also
freezes everything.

How can I disable the HDR setting? The monitor doesn’t show in System Settings
whilst its unplugged so I’m hoping theirs some way to fix it on the CLI. The
only place I’ve found HDR referenced is .config/kwinoutputconfig.json. I set
HDR to false but after reboot it’s set to true again. I also tried deleting
.config/kwinrc and .local/share/kscreen but no luck.


STEPS TO REPRODUCE
1. Enable HDR on Monitor in System Settings > Display


OBSERVED RESULT
- HDR monitor goes black
- Other monitor now unresponsive.
- System works if monitor is not plugged in on start up
- Cannot disable HDR setting in UI without the monitor plugged in. If I plug in
the monitor then the system freezes.
- Monitor also does not appear in kscreen-doctor when unplugged.

EXPECTED RESULT
- System does not freeze
- Saved monitor settings can be modified or cleared even when disconnected.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Manjaro
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.3

ADDITIONAL INFORMATION
Lemmy Community Discussion https://lemmy.kde.social/post/1104524
Similar to https://bugs.kde.org/show_bug.cgi?id=483600 but if I use only the
HDR monitor it still has the issue.

Fixed by
- Ctrl + Alt + F3 to go into terminal
- Set `HighDynamicRange` and `WideColorGamut` to false in
~/.config/kwinoutputconfig.json
- Execute `plasmashell --replace`
- Reboot, Login, Reattach HDR Monitor


- AMD based Desktop
- Nvidia GPU
- Dual Monitor Setup (BenQ and Gigabyte)
- HDR setting enabled on Gigabyte.
- Installation is approximately 4 years old.

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