screen brightness on HP dv7

Original: http://ubuntuforums.org/showthread.php?t=1906803

Run this in a terminal:

Code:

sudo nano /etc/default/grub

and change this line:

Code:

GRUB_CMDLINE_LINUX=""

to:

Code:

GRUB_CMDLINE_LINUX="acpi_backlight=vendor"

Save the file and run:

Code:

sudo update-grub

Now reboot. Your function keys for brightness should now work.