https://bugs.kde.org/show_bug.cgi?id=488935

--- Comment #3 from Eamonn Rea <eamonn...@protonmail.com> ---
Just as a follow-up in case someone else stumbles across this, this is indeed
related to AMD firmware, as per the Power Profiles Daemon Readme
(https://gitlab.freedesktop.org/upower/power-profiles-daemon#panel-power-savings):

> Laptops with integrated Radeon graphics have a dedicated hardware function
> to decrease panel power consumption in exchange for color accuracy. This
> function is used when the system is on battery and the user has selected
> the "balanced" or "power-saver" profiles.

Although colour accuracy doesn't seem to be affected for me outside of "Power
Saver".

The Readme also has instructions for how to disable this.

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