https://bugs.kde.org/show_bug.cgi?id=482278

--- Comment #19 from David Warner <david.p.war...@gmail.com> ---
(In reply to David Warner from comment #18)
> (In reply to Jakob Petsovits from comment #17)
> > (In reply to David Warner from comment #16)
> > > This might be an edge case not worth worrying about, but yesterday I had a
> > > brief power outage and my monitors were all set to 30% when I turned my PC
> > > back on - I guess the previous state isn't retained in this scenario.
> > 
> > This counts as system restart, which is Bug 494722. It's marked as resolved
> > because Plasma 6.3 should fully fix this on Wayland (at the cost of not
> > recognizing OSD menu changes to a monitor's brightness level, only changes
> > through KWin such as brightness applet slider / brightness slider will be
> > remembered). For X11, that issue is a WONTFIX as PowerDevil itself doesn't
> > store brightness values in a config file, so it has no way of bringing back
> > the un-dimmed brightness, at least in case of a power outage.
> 
> I might need to open a separate bug for this, but I wonder if this Plasma
> 6.3 change is responsible for a new issue I'm seeing where KDE is somehow
> mapping 100% brightness to 30% brightness per the monitor's settings. I've
> disabled screen dimming for now.

I could have worded that more clearly - I meant to say that 100% brightness in
the KDE applet sets the monitor brightness to 30% (per the OSD controls). 50%
brightness -> 15%, etc.

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