Changing the brightness stopped working in 13.10 Saucy Salamander

Solution 1:

the only way to change brightness is to use this command

sudo su

echo 150 > /sys/class/backlight/intel_backlight/brightness

all other solution does not work at the moment. this is not my work around. I don't remember where I found this but it works and hats off to the person who gave this workaround :)

Using Ubuntu 13.10 64Bit Wubi on Lenovo Z570

Solution 2:

If you're using intel video card do:

sudo -H gedit /usr/share/X11/xorg.conf.d/20-intel.conf 

Add the following in the empty file then log out and log in again or reboot. That should fix your problem.

Section "Device"
    Identifier  "card0"
    Driver      "intel"
    Option      "Backlight"  "intel_backlight"
    BusID       "PCI:0:2:0"

EndSection

Solution 3:

As Timo Aaltonen (tjaalton) brought to my attention on IRC, this is bug related to the latest drivers nvidia-319-updates. Reverting back to 304 fixed my problems, although I call this rather a workaround than a fix, as I won't get many of the recent performance improvements of newer drivers.