https://bugs.kde.org/show_bug.cgi?id=495545

--- Comment #8 from synthetix <[email protected]> ---
Replying here because my other bug report was marked as a duplicate.

Yes, I have reason to believe this is absolutely related to HDR. The reason is
the backlight driver is triggered based on the brightness of the content
on-screen, and in my case this cannot be disabled. I confirmed this by
observing the brightness values in /sys/class/backlight/. For example, if I
minimize and maximize a window with full white, the backlight values in
/sys/backlight change without me doing anything else. So something is clearly
manipulating the backlight driver based on whatever the compositor is doing. If
you have a suggestion of somewhere else to troubleshoot this behavior, I'm open
to suggestions. But this is problem didn't start until the new SDR->HDR feature
was added.

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