I guess what you might be after is called DDC/IC or MCCS: http://en.wikipedia.org/wiki/Display_Data_Channel#DDC.2FCI
Not sure what part of OpenBSD manages this. On Tue, May 5, 2015 at 11:47 PM, Sandrine Duvalier <clementine.duval...@gmail.com> wrote: > Hi! > > Not sure if this is possible but I'd like to dim my external display's > backlight. Unfortunately this gives: > > $ xbacklight > No outputs have backlight property > > One can do "xrandr --output DP2 --brightness 0.5", but this only makes the > colors less bright (as opposed to dimming the backlight). > > Any ideas? > > Thanks! > > Clementine > > > $ xrandr > Screen 0: minimum 320 x 200, current 2560 x 1440, maximum 32767 x 32767 > DP1 disconnected (normal left inverted right x axis y axis) > HDMI1 disconnected (normal left inverted right x axis y axis) > DP2 connected 2560x1440+0+0 (normal left inverted right x axis y axis) > 553mm x 311mm > 2560x1440 59.95*+ > 2048x1152 60.00 > 1920x1200 59.88 > 1920x1080 50.00 30.00 > 1600x1200 60.00 > 1680x1050 59.95 > 1280x1024 75.02 60.02 > 1200x960 59.99 > 1152x864 75.00 > 1280x720 50.00 > 1024x768 75.08 60.00 > 800x600 75.00 60.32 > 720x576 50.00 > 720x480 59.94 > 640x480 75.00 60.00 59.94 > 720x400 70.08 > HDMI2 disconnected (normal left inverted right x axis y axis) > VIRTUAL1 disconnected (normal left inverted right x axis y axis)
