Hi everyone,

I recently installed KDE Neon 5.20 on an old laptop, on a fresh new SSD disk. Everything works fine, but I have one matter : I just can't change the screen brightness. The option does not even appear on Power Management tab, and it does not appear in the "Battery and brightness" widget. In addition, the Night color function does not work as well. It seems that I can't change any parameters regarding screen color / brightness. I tried to install additional packages to adjust Brightness (like Brightness controller in Synaptic), but moving the cursor did not do anything.

Is there anything I can do to solve this problem ?

If you need any additional information, feel free to ask and I will try to provide them as fast as possible !

Thank you very much and have a nice day.

Pierre.

I have the same problem, except I can see the slider and move it, but nothing happens. Try running

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xev -event keyboard

and see if that fixes anything. For me it enabled the F2 and F3 keys to raise and lower the brightness slide. But not actually changing the brightness of the screen. Seems like a lot of people have this issue currently, and no one seems to have a fix, especially for AMD computers.

I think I have a solution to your invisible brightness bar. Got to /etc/default/grub and find the line

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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

If there is anything after quiet splash, remove it, and keep the line as I wrote it. This should fix your problem. At least this is what I have discovered when testing.