I can also confirm that the suggestion posted by "Pierre Chifflier"
works. Though myself not being a computer geek I had problems
implementing it. Below is the example of how it looks on my xorg.conf
file and this works for me.
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "TwinView" "1"
Option "TwinViewXineramaInfoOrder" "DFP-2"
Option "metamodes" "DFP-0: 1680x1050 +1920+15, DFP-2: 1920x1080
+0+0"
Option "RegistryDwords" "EnableBrightnessControl=1"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Note: this is just an example for those who don't know where the
following line appears
Look above for => Option "RegistryDwords"
"EnableBrightnessControl=1"
Thanks everyone, Special Thanks to "Pierre Chifflier"
Cheers,
Hemant
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https://bugs.launchpad.net/bugs/762670
Title:
Laptop brightness on Dell XPS not controllable
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