https://bugs.kde.org/show_bug.cgi?id=494497

--- Comment #7 from Simeon Andreev <simeon.danailov.andr...@gmail.com> ---
(In reply to Jakob Petsovits from comment #3)
> (In reply to Simeon Andreev from comment #1)
> > Any workarounds for this?
> 
> As mentioned, the straightforward way is to manually set a brightness value
> through Plasma. Both the Brightness and Color applet and the Power
> Management page in System Settings would do the job, if you're on desktop
> then probably the applet is what you want.

I have tried to use the setting. Unfortunately I see odd behavior.

As first mentioned, I have 2x of the same LG display. One I use for my desktop,
the other I share between my desktop and my laptop (for work I use the display
for my laptop, in my free time I use it for my PC; my desk has no room for 3
displays). My desktop is on KDE 6.2, my laptop is on KDE 5.24 (for reasons).

As long as I use a static setup (e.g. this weekend I used the 2 displays only
for my PC), the setting works fine.

As soon as I start switching the display between my PC and my laptop, there is
odd behavior. My 2nd display drops in to very very low levels of brightness,
after starting to use it from my PC. I do use dccutil to switch around the
inputs of the 2nd display, maybe that somehow interferes with what KDE is
doing...

> Alternatively, the PowerDevil README describes how to set the
> POWERDEVIL_NO_DDCUTIL environment variable, which will disable brightness
> controls for external DDC/CI monitors:
> https://invent.kde.org/plasma/powerdevil/-/blob/master/README.
> md#troubleshooting-ddcci-monitor-brightness-controls.

I have done that and disabled the KDE brightness setting (I'm not sure if the
latter was necessary or I just observed more weird behavior)... For the last
few switches between displays I've not observed weird behavior. Hopefully there
are no further issues.

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