https://bugs.kde.org/show_bug.cgi?id=511216

Zamundaaa <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |WAITINGFORINFO
             Status|REPORTED                    |NEEDSINFO

--- Comment #9 from Zamundaaa <[email protected]> ---
Oh, so the screen in question is connected to the Intel GPU, not NVidia.

> [  149.829931] i915 0000:00:02.0: [drm:skl_fixup_initial_plane_config [i915]] 
> [CRTC:80:pipe B] dbuf slices 0x1 -> 0x1, ddb (223 - 446) -> (223 - 669), 
> active pipes 0x7 -> 0x7
> [  149.829987] i915 0000:00:02.0: [drm:skl_fixup_initial_plane_config [i915]] 
> [CRTC:104:pipe C] dbuf slices 0x1 -> 0x1, ddb (446 - 892) -> (669 - 892), 
> active pipes 0x7 -> 0x7
> [  149.830043] i915 0000:00:02.0: [drm:skl_fixup_initial_plane_config [i915]] 
> Requested display configuration exceeds system DDB limitations
> [  149.830096] i915 0000:00:02.0: [drm:skl_fixup_initial_plane_config [i915]] 
> minimum required 242/199

That looks like the commit broke the implicit modifier fallback, instead of
just expanding it. If you set
https://invent.kde.org/plasma/kwin/-/wikis/Environment-Variables#kwin_drm_use_modifiers
to 0, does that help?

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