you need to manually set the boot parameter 'acpi_backlight=vendor' if you use grub as your boot manager, edit /boot/grub/grub.cfg and add the parameter to the end of the appropriate line that begins with 'linux'.
be sure to do this whenever you get kernel updates too.
naveen,
you need to manually set the boot parameter 'acpi_backlight =vendor' if you use grub as your boot manager, edit /boot/grub/grub.cfg and add the parameter to the end of the appropriate line that begins with 'linux'.
be sure to do this whenever you get kernel updates too.