Ingo Gerth, as per the forum post of another HP EliteBook 8560w (different
card), NVIDIA advised to update the BIOS, and another user advised that
updating the driver to 375.66 worked for them:
https://devtalk.nvidia.com/default/topic/539462/linux/-nvidia-319-12-brightness-controls-not-working-on-laptop-ubuntu-13-03-/5
Could you please advise on your BIOS version, update to a supported
version of Ubuntu, and advise if testing the latest NVIDIA driver for
your release works?
** Tags removed: bios-outdated-f.42
** Tags added: bios-outdated-f.50
** No longer affects: nvidia
** Changed in: nvidia-graphics-drivers-319 (Ubuntu)
Status: Triaged => Incomplete
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https://bugs.launchpad.net/bugs/1241745
Title:
10de:0dfa [HP EliteBook 8560w] Changing the screen brightness does not
work anymore in 319.xx
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