Sometimes, if you cannot find the options to reduce the system ( Intel Board ) brightness & Lock setting in Ubuntu just following the steps,
phase 1 :
Open your terminal window, then open the grub file using gedit text editor,
$ sudo gedit /etc/default/grub
Find the line that says:
GRUB_CMDLINE_LINUX="quiet splash"
Need to include the word acpi_backlight=vendor within the line,
GRUB_CMDLINE_LINUX="quiet splash acpi_backlight=vendor"
Save and exit
:wq!
run the update-grub command
$ sudo update-grub
Generating grub configuration file ...
Warning: Setting GRUB_TIMEOUT to a non-zero value when GRUB_HIDDEN_TIMEOUT is set is no longer supported.
Found linux image: /boot/vmlinuz-3.19.0-15-generic
Found initrd image: /boot/initrd.img-3.19.0-15-generic
done
Finally, reboot your system
$ sudo init 6
If the phase 1 is could not be changed goes to phase 2 :
phase 2 :
Create a file
$ sudo vim /usr/share/X11/xorg.conf.d/80-backlight.conf
Add below lines,
Identifier "Intel Graphics"
Driver "intel"
Option "AccelMethod" "sna"
Option "Backlight" "intel_backlight" # use your backlight that works here
BusID "PCI:0:2:0"
EndSection
Save and exit.
:wq!
Reboot the system
$ sudo init 6
If the both phase 1 and 2 could not be changed just follow it.
phase 3:
$ sudo echo 0 | sudo tee /sys/class/backlight/intel_backlight/brightness
Reboot the system
$ sudo init 6
Comments (0)