I managed to solve the problem in a much cleaner way.
I tried to create a custom xorg.conf file with the following content but
my system didn't boot.
Section "Device"
Identifier "Intel Graphics"
Driver "intel"
Option "Backlight" "intel_backlight" # use your backlight that
works here
EndSection
Finally, I tried the following procedure:
http://askubuntu.com/a/281685/27968
I got errors when starting lightdm BUT it created a xorg.conf.failsafe
file.
I opened it and modified it by adding the option line under "Device" as
follows:
Section "Device"
Identifier "Configured Video Device"
Driver "intel"
Option "Backlight" "intel_backlight"
EndSection
#
Section "Monitor"
Identifier "Configured Monitor"
EndSection
#
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
EndSection
And bingo! Everything is working as it should.
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https://bugs.launchpad.net/bugs/1069144
Title:
[Toshiba Satellite R830-1H3] brightness control works until sleep
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