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I seem to find very old threads and results when googling.

I have an Asus UX331UAL and my keyboard brightness worked fine when I used Manjaro KDE. Now when I have Ubuntu 18.10 they keystroke registers (I see the HUD pop up but with no possible changes). How can I fix this?

I tried "xset led 3" in the terminal, and "xset led on". nothing happens.

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I struggled with the keyboard back light issue on a 2011 Macbook pro, I installed radeontool which solved the issue F4 &F5 now perform correctly.

sudo apt-get install radeontool
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Thanks everyone!

Updating the kernel to 4.19 solved my issue.

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