Brightness keys (if not implemented in hardware directly) need to be
known and mapped by the kernel.
Please:
1. Tell us the exact laptop model.
2. Run: sudo apt install evtest
3. Run: sudo evtest
4. Select your keyboard and then tap the Fn+brightness keys.
5. Copy and paste what you see in the evtest output.
** Tags added: nvidia
** Package changed: gnome-shell (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1822665
Title:
Brightness can't be changed from keyboard
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