Is Your have two video cards?
Same problem exists on Ubuntu Linux.
Try xrandr
F.e. xrandr --output LVDS1 --brightness 0.75
On 27.06.2014 03:18, Riccardo Mottola wrote:
Hi,
I noticed that since I upgraded to 5.5, the two keys that controls the
screen brightness do not work anymore, my LCD is constantly set to a
mid-dark. This happens when the new framebuffer console runs, but also
when X11 runs.
During BIOS post or furing the first boot phase, setting works, but
will reset as soon as the framebuffer loads.
Posts on the net seem to succest xbacklight, but I get:
$ xbacklight
No outputs have backlight property
Suggestions? Getting the two keys (those activated by the blue Fn)
would be the best of course.
Riccardo
