[HOWTO] Laptop Screen Backlight Function Keys Don’t Dim or Brighten the Screen
If the keyboard backlight keys fail to work, here’s a solution. Append acpi_backlight=vendor to grub’s bootloader strings and to the grub’s default file so new kernel’s will also have the correct parameter.
Switch up to root
su - Password: xxxxx
Exit the grub boot file and default file
vi /boot/grub2/grub.cfg /etc/default/grub
Search for ‘quiet’
/quiet
Append ‘acpi_backlight=vendor’
A acpi_backlight=vendor
Tap Esc key
For each remaining
Tap n key to search for the next ‘quiet’ entry
Tap . to append acpi string
Tap Esc key
Save changes and move to the default file
:wn
Search for ‘quiet’
/quiet
Append ‘acpi_backlight=vendor’
acpi_backlight=vendor
Tap Esc key
Save changes
:wq
Push the change to grub.cfg
grub2-mkconfig -o /boot/grub2/grub.cfg
Reboot
Fedora 15, 16, 17, 18, 19
David Gregory Medina
Post created by: David Gregory Medina
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