So today 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.

I’m fine with just resetting all Display settings if that’s required.

----- UPDATE ------

Bug report filed here: https://bugs.kde.org/show_bug.cgi?id=485403

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

------ UPDATE ------

After updating and trying again today the steps above no longer worked. You still need to change ~/.config/kwinoutputconfig.json but plasmashell --replace no longer works for me.

Running killall kwin_wayland also just bumps me from my terminal back into the desktop. kwin can’t be running when you change that file or it will be overridden.

I booted into a separate Linux Live USB and change the files that way.

Thank you everyone for your help 🎉

  • @Codilingus@sh.itjust.works
    1•8 months ago

    I don’t think that is something any HDR monitor can do, unfortunately. They just let you know it’s in HDR mode.

    Edit: I stand corrected.

    • @SpacetimeMachine@lemmy.world
      5•8 months ago

      My monitor AW2432DWF does allow you to turn off HDR, although it is a relatively recent monitor and my first HDR one, so I don’t know how common that is.

    • @Dudewitbow@lemmy.zip
      4•8 months ago

      HDR for the most part, is a two way feature. must be enabled by driver/de as well as enabled on the monitor for it to in work, because its not always ideal to have local dimming enabled on monitor (one of the key components required for HDR)