Comment # 4 on bug 905681 from Vladimir Perepechin

laptop: samsung np510r5e

Yep, after setting video.use_native_backlight=0 i'm able to controll
brightness.
But when setting it to minimum sceen is still on.

Now:

ls -l /sys/class/backlight/
���������� 0
lrwxrwxrwx 1 root root 0 ������ 17 17:31 acpi_video0 ->
../../devices/pci0000:00/0000:00:01.0/0000:01:00.0/backlight/acpi_video0
lrwxrwxrwx 1 root root 0 ������ 17 17:31 acpi_video1 ->
../../devices/pci0000:00/0000:00:02.0/backlight/acpi_video1
lrwxrwxrwx 1 root root 0 ������ 17 17:31 intel_backlight ->
../../devices/pci0000:00/0000:00:02.0/drm/card1/card1-LVDS-1/intel_backlight