I have an ASUS X552CL with a nvidia gforce 710M and the bug appeared
when I was using Ubuntu Gnome 14.04.1. I installed nvidia-331 drivers
with bumblebee (my laptop has two video cards, Intel and Nvidia)
(trought this video https://www.youtube.com/watch?v=nMqVFeFk9rI) and all
works fine but a week after I couldn't use brightness control neither
the keyboard nor gnome settings (the indicator dissapeared!).
After this, I installed Ubuntu 14.04.1 (original) and all works fine but
when I installed bumblebee and all necesary packs to use my two video
cards, the brightness indicator disappeared again, and keys of
brightness control didn't work.
I tryed to fix it trought:
1) Fist fix:
At first, I write this to know which video card manage the bright of my
display
ls /sys/class/backlight/
acpi_video0 acpi_video1 intel_backlight
After this I created a configuration file to intel videocard with:
sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf
sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf
And I added the next parameters:
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
I rebooted my laptop and brightness control still didn't work.
Source (In spanish, sorry): http://www.atareao.es/ubuntu/corrigiendo-el-
brillo-en-ubuntu-trusty-tahr/
2) Second fix: the same fix that Arizsló, but didn't work.
3) Third fix:
I change the drivers from nvidia-331 to nvidia-340 and the brightness
control still didn't work.
Now, I only use intel videocard to brightness control works.
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https://bugs.launchpad.net/bugs/1342786
Title:
Brightness OSD killed by nvidia-prime
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