Setting a display's backlight brightness to be lower than is possible via the normal brightness controls
- by Drew Noakes
By normal brightness controls I mean the accelerators on my laptop's keyboard that seem to integrate with Unity.
In a dark room, my screen is quite bright, even on the lowest setting. Can I override this?
I tried setting it explicitly via both:
sudo echo 500 > /sys/class/backlight/acpi_video0/actual_brightness
sudo echo 500 > /sys/class/backlight/intel_backlight/actual_brightness
But I get a permission denied error.
When at the lower bounds via my keyboard's brighness controls, acpi_video0/actual_brightness is 0, and intel_backlight/actual_brightness is 729. Can I set the latter value to be even lower?
