Re: [Trisquel-users] problem with laptop keyboards

[t8mf4nu6lizp]

That ath9k is unrelated, not sure about the others. If you can change the  
brightness somehow e.g. a key binding do so and see if the contents of those  
3 files changes.

Then you could try changing the contents yourself to see if that changes  
brightness. (note that you can't sudo echo blabla > file, you need to sudo sh  
-c 'echo blabla > file')