Brightness change not supported by modesetting
Submitted by nic..@..us.org
Assigned to Xorg Project Team
using modesetting with the intel HD5500 results in backlight properties not being accessible:
[18:12] wurzel:~% xbacklight -set 20 No outputs have backlight property
Even though they are present and also picked up by the intel driver:
[18:12] wurzel:~% cat /sys/class/backlight/intel_backlight/brightness 511
It would be awesome if the modesetting driver was supporting this, as it's the only drawback of it compared to the intel driver (which is horribly slow).