Turn off backlight without X server commands

Posted by Vi on Super User See other posts from Super User or by Vi
Published on 2010-05-10T23:57:39Z Indexed on 2010/05/11 0:04 UTC
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Filed under:

backlight

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linux

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xorg

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laptop

Fn + F6 - backlight turns off immediately, image stays (visible if shine something at the display)

xset dpms force {off,suspend,standby} - backlight turns off slowly, image cleared.

How to programmatically just turn off backlight on Acer Extensa 5220 laptop in Linux? It should work fast and should not touch image (unlike xset method).

Ideally if I could rapidly switching backlight off and on emulate lower_than_minimum brightness level (ideally - to be hardly visible (but visible) at night).

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