https://bugs.kde.org/show_bug.cgi?id=494854

--- Comment #6 from Zamundaaa <[email protected]> ---
I think I see how this could happen; if the min. luminance HDR metadata is
zero, but the transfer function's minimum is not completely zero, then that
minimum would be mapped to a value >0 by black point compensation.

(In reply to FK from comment #5)
> Btw. I have had the issue of enabling HDR sometimes not properly triggering
> the display since the inception of HDR in kwin. This happens when I turn it
> off and on again, it appears it's not sending the proper mode to the
> display. The HDR logo doesn't show and colors are washed out.
That's a GPU driver bug, which you can report at
https://gitlab.freedesktop.org/drm/amd/-/issues

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