Keyboard layout, FN brightness

Question

I have installed ubuntu mate on my Lenovo 15IAU7 and i can not use the FN+F5 and FN+F6 to control the screen brightness. When i press the key combination it does nothing. Other FN keys work ok, like the volume, airplane mode...

I ran xev -event keyboard but pressing FN+F5 and FN+F6 outputs nothing. On other FN keys it displays the same message:

KeymapNotify event, serial 26, synthetic NO, window 0x0,
keys:  110 0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   
       0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0  

What ways are there to fix this?

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Distributor ID: Ubuntu Description: Ubuntu 22.04.2 LTS Release: 22.04 Codename: jammy

Answer 1

You can add this as a custom keyboard shortcut.

System settings > search for "shortcuts" > Select Power Management in middle column.

Then check (right column):

*decrease screen brightness

*increase screen brightness

And add custom shortcuts for both

Hope this helps.