Setting a display's backlight brightness to be lower than is possible via the normal brightness controls

Posted by Drew Noakes on Ask Ubuntu See other posts from Ask Ubuntu or by Drew Noakes
Published on 2013-04-16T23:11:59Z Indexed on 2013/10/29 10:20 UTC
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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?

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