Arch Linux

starfox

Member

Registered: 2010-04-24

Posts: 16

Using /acpi_video0/brightness file to set LCD backlight

If I edit my /sys/class/backlight/acpi_video0/brightness file between 0 and 7 it changes my LCD brightness in integer chunks, but it won't go down to zero.

What I want to do it use this file to bring the LCD brightness all the way down to zero. Writing the file to "0" doesn't do this, the backlight is still quite bright. Why is this?

Aside: the only reason I care is because "xset dpms force off" doesn't turn the screen off and no one here knows why.

starfox

Member

Registered: 2010-04-24

Posts: 16

Re: Using /acpi_video0/brightness file to set LCD backlight

bumpy

Proofrific

Member

Registered: 2008-01-05

Posts: 215

Re: Using /acpi_video0/brightness file to set LCD backlight

Aside: the only reason I care is because "xset dpms force off" doesn't turn the screen off and no one here knows why.

I use xrandr to completely turn off my monitor.  For my laptop, the command is:

xrandr --output LVDS1 --off

Yours might be "LVDS" instead of "LVDS1".  Run "xrandr" by itself to see what's connected and what it's called.