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After installing the Nvidia proprietary drivers (the nuovo drivers had problems with flickering on the external monitor) the backlight brightness could not be set anymore (neither with keys nor with power settings).

Tried many hints but nothing worked.

1

Instead install the nvidiabl module to make /sys/class/backlight/nvidia_backlight/ work again.

  1. Download nvidiabl from https://github.com/guillaumezin/nvidiabl
  2. Go to folder nvidiabl-master
  3. Edit nvidiabl-module.c line 213 and replace strnicmp to strncasecmp
  4. make && make install
  5. Reboot to make buttons work again (via powersave settings it should work right away)

Now you should have a module called nvidiabl loaded and the brightness setting works again!

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