I'm having this same problem with the backlight as I already commented in #201533. I got it working with xbacklight by changing the BACKLIGHT_CONTROL from kernel to native, whatever that means:
$ xrandr --output LVDS --set BACKLIGHT_CONTROL native
I'm having this same problem with the backlight as I already commented in #201533.
I got it working with xbacklight by changing the BACKLIGHT_CONTROL from kernel to native, whatever that means:
$ xrandr --output LVDS --set BACKLIGHT_CONTROL native