I'm with 16.10 and Yoga X1 OLED beast of a laptop but unfortunately can't control the display brightness. It's at the maximum. Both the keyboard and settings control move the slide bar but it does nothing to the actual brightness and it stays at maximum.
I just stumbled on this question, looking for an answer I gave a while ago regarding OLED screens in X11. See here. I normally bind some variations of the command to some keys, so I can switch fast:
xrandr --output eDP1 --brightness 1 # no dimming xrandr --output eDP1 --brightness .5 # dim to half
Entering xrandr by itself shows the device-name to be used (
eDP-1 or the like). The number can be anything between 0 and 1.
Floating point numbers can be used. If the value is greater than 1 screen goes above normal brightness but colors become saturated.
Might be related to this:
recently we began to receive feedback in regards to the non-OLED models that either the display brightness keys (F5/F6) do not work to change the brightness
The Alienware 13 r3 with OLED screen seems to have the same issue. The only solution is to use xrandr, but that does not work on Wayland.