Dear Sirs!
I am completely newbie in Linux and in Linux Mint in particular. In my
case adding Option "RegistryDwords" "EnableBrightnessControl=1" clause
in xorg.conf did not change anything in brightness.
uname -a
Linux Dell-XPS-L702X 4.10.0-38-generic #42~16.04.1-Ubuntu SMP Tue Oct 10
16:32:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Xorg.conf
# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 387.22 (buildd@lgw01-amd64-017) Tue Oct 31
00:34:18 UTC 2017
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
Option "Xinerama" "0"
EndSection
Section "Files"
EndSection
Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "LGD"
HorizSync 67.0 - 137.0
VertRefresh 60.0 - 119.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce GT 555M"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "Stereo" "0"
Option "nvidiaXineramaInfoOrder" "DFP-2"
Option "metamodes" "DP-1: 1920x1080_120 +0+0, DP-2:
nvidia-auto-select +1920+0"
Option "SLI" "Off"
Option "MultiGPU" "Off"
Option "BaseMosaic" "off"
Option "RegistryDwords" "EnableBrightnessControl=1"
SubSection "Display"
Depth 24
EndSubSection
EndSection
Please, be so kind, help me in solving that issue. I could not imagine before
that impossibility to change display brightness may drive someone crazy.
By the way, I performed all steps concerned brightness described at the
following topic. To my regret I got no results.
https://sites.google.com/site/easylinuxtipsproject/display#TOC-
Brightness-of-the-display-is-wrong-and-not-adjustable
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/762670
Title:
Laptop brightness on Dell XPS not controllable
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/762670/+subscriptions
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