After I upgraded to kde6 when it was first came out, I was finally able to change my external monitor brightness inside linux. However recently, it is no longer even appearing in the brightness widget in the system tray like it should. btw I ran an update this morning and that still hasn’t fixed it.
Are you logged in with a Wayland session, or X11? Try Wayland, if you’re not already.
It is a wayland session. Been on wayland since kde5
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Are you able to get a brightness value from your display?
ddcutil getvcp 10
Or to query a particular monitor (-d 1, -d 2 etc):
ddcutil -d 1 getvcp 10
ddcutil -d 2 getvcp 10
You can try setting it there too (80 below being the brightness to set it to, so you can change this to what you want):
ddcutil setvcp 10 80
the second command just outputs:
VCP code 0x10 (Brightness ): current value = 1, max value = 100
Display not found
Do you get anything from the first?
ddcutil getvcp 10
Nope it just shows the one. The monitor that is not showing up is really old, that’s why I was excited when it initially worked.