Re: how to turn off backlight in console (without any X server)
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On Tue, Nov 01, 2016 at 02:22:46PM +0100, Laurent Debian wrote:
> Hi all,
>
> I would like to turn off the backlight completly on a mac book pro 2008
> (sid).
> I don't have any x server. Does it explains this error ?
Most probably yes. "Xbacklight" hints at an X application. RandR is an
X server extension.
> > xbacklight -set 10
> > RANDR Query Version returned error -1
> >
>
> the graphic card is
> 02:00.0 VGA compatible controller: NVIDIA Corporation C79 [GeForce 9400M]
> (rev b1)
> nouveau is loaded by the kernel.
I'd imagine that xbacklight (and xrandr) try to talk to the X server to
do their bidding.
>
> Any way to turn off the backlight without installing X woudl be greatly
> appreciated.
Have a look at the files under /sys/class/backlight. For me, this works:
sudo bash -c "echo 2 > /sys/class/backlight/acpi_video0/brightness"
Enjoy
- -- t
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