Disable KDE monitor brightness control?

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There has been a lot of brightness work in Plasma 6.2, with some new features to manage multi-screen brightness control, and unfortunately it looks like introduced some unintended behaviors. There are quite a few discussions about this in this forum, here’s a link to one that lists some relevant bug reports that you may want to track.

Regarding how to disable powerdevil DDC control:

  1. Open a terminal (for example, by running Konsole)
  2. Run the command systemctl --user edit plasma-powerdevil.service
  3. In the editor that opens, in the first open section, type:
[Service]
Environment=POWERDEVIL_NO_DDCUTIL=1

then save and exit.
4. Log out and log back in.

If you ever want to revert that, you can run the edit command again and remove those lines, or simply delete the directory ~/.config/systemd/user/plasma-powerdevil.service.d

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