Screen brightness keys not working

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Hi all,

The Fn keys to increase/decrease the screen brightness always worked, but have stopped working at some point, and the problem is that I have no clue what may have caused it, because I don't remember when was the last time I used them.

It's an LG Gram running an up-to-date F40 KDE. Not sure if this may be a kernel issue, or a Plasma issue, or... Does anyone know how to debug this? I see:

$ ls /sys/class/backlight/
intel_backlight

Other Fn keys work ok, such as volume keys, backlight for the keyboard, airplane mode... And I can change the brightness just fine via the Plasma "Display brightness" slider. It's just these Fn keys that do not work.

Best,
--
Iñaki Úcar
-- 
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