Ubuntu – Brightness controls not working on a Sony Vaio VPCEH38FN

brightnessscreen

I have ubuntu 12.04 installed on windows 7. When I use the Fn alongside the key to reduce brightness, or even using the system settings, I am not being able to reduce the screen brightness. What is the problem?

Best Answer

Run:

sudo gedit /etc/default/grub

Update these lines:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""

... with the following arguments:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Then run sudo update-grub and reboot.

Related Question