Setting a display's backlight brightness to be lower than is possible via the normal brightness controls
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Drew Noakes
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Published on 2013-04-16T23:11:59Z
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2013/10/29
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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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