https://bugs.kde.org/show_bug.cgi?id=506645

--- Comment #6 from Christopher Snowhill <[email protected]> ---
(In reply to Dominick DiMaggio from comment #5)
> In the meantime, `KWIN_DISABLE_TONEMAPPING=1` gets around the issue for me.

So I was correct that it was the tonemapping filter. But I think the real
culprit, if tonemapping is to be used at all, is that it's tonemapping to the
SDR brightness range, when it should be tonemapping to the configured peak
brightness level, which is the first setting in the HDR tuner. This setting is
supposed to be autodetected from the display, but can be overridden.

If it's failing even when tonemapping to the absolute peak brightness of the
display, something else is wrong with the whole tonemapping thing. :/

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