I manually fixed it by created an acpid event handler, however in my solution, it only works when changing the brightness with the Fn-keys, but not by changing /sys/class/backlight/acpi_video0/brightness value.
Link Dupont's fix works better (but I didn't use video.use_native_backlight=1 on GRUB_CMDLINE_LINUX as he said). By the way, the link to his solution is dead. This one works: http://sub-pop.net/post/fedora-23-on-system76-oryx-pro/
Same issue with GTX 980M on Ubuntu 16.04, even with latest NVIDIA drivers (367.27).
I described this on NVIDIA forums: /devtalk. nvidia. com/default/ topic/942337/ linux/backlight -brightness- not-hooked- to-acpi- events- ubuntu- 16-04-/
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I manually fixed it by created an acpid event handler, however in my solution, it only works when changing the brightness with the Fn-keys, but not by changing /sys/class/ backlight/ acpi_video0/ brightness value.
Link Dupont's fix works better (but I didn't use video.use_ native_ backlight= 1 on GRUB_CMDLINE_LINUX as he said). By the way, the link to his solution is dead. This one works: http:// sub-pop. net/post/ fedora- 23-on-system76- oryx-pro/