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Groups > linux.debian.user > #174118 > unrolled thread

how to turn off backlight in console (without any X server)

Started byLaurent Debian <laurent.debian@gmail.com>
First post2016-11-01 14:30 +0100
Last post2016-11-08 14:20 +0100
Articles 5 — 3 participants

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  how to turn off backlight in console (without any X server) Laurent Debian <laurent.debian@gmail.com> - 2016-11-01 14:30 +0100
    Re: how to turn off backlight in console (without any X server) <tomas@tuxteam.de> - 2016-11-01 14:50 +0100
      Re: how to turn off backlight in console (without any X server) Laurent Debian <laurent.debian@gmail.com> - 2016-11-08 12:00 +0100
        Re: how to turn off backlight in console (without any X server) tomas@tuxteam.de - 2016-11-08 14:10 +0100
          Re: how to turn off backlight in console (without any X server) Laurent Debian <laurent.debian@gmail.com> - 2016-11-08 14:20 +0100

#174118 — how to turn off backlight in console (without any X server)

FromLaurent Debian <laurent.debian@gmail.com>
Date2016-11-01 14:30 +0100
Subjecthow to turn off backlight in console (without any X server)
Message-ID<syHix-MM-9@gated-at.bofh.it>

[Multipart message — attachments visible in raw view] — view raw

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 ?

>  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.

Any way to turn off the backlight without installing  X woudl be greatly
appreciated.

Cheers,
Laurent.

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#174119

From<tomas@tuxteam.de>
Date2016-11-01 14:50 +0100
Message-ID<syHBT-Ty-11@gated-at.bofh.it>
In reply to#174118
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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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#174339

FromLaurent Debian <laurent.debian@gmail.com>
Date2016-11-08 12:00 +0100
Message-ID<sBcid-8hA-3@gated-at.bofh.it>
In reply to#174119

[Multipart message — attachments visible in raw view] — view raw

Hi and thanks for your ideas

Unfortunately there is no directory  /sys/class/backlight on my system.
After a

> locate backlight
>
I juste had the following files as seemingly relevant.

> /var/lib/systemd/backlight/pci-0000:02:00.0:backlight:nv_backlight
> /var/lib/systemd/backlight/platform-applesmc.768:leds:smc::kbd_backlight
>
Which were both at 100 but an echo 0 > ....  had no effect on the backlight
(tough it tuned to 0 the value of in the  files )
Any ideas where I should start to look at ?

Cheers,


2016-11-01 14:49 GMT+01:00 <tomas@tuxteam.de>:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> 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
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.12 (GNU/Linux)
>
> iEYEARECAAYFAlgYnW0ACgkQBcgs9XrR2kb+vQCfaJwwyrg9ZpPdlmLpYkQwhpJ2
> fS8An1rsuKp8O8dq3X0NwjKP1mMGS37w
> =LcrE
> -----END PGP SIGNATURE-----
>
>

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#174345

Fromtomas@tuxteam.de
Date2016-11-08 14:10 +0100
Message-ID<sBek1-1kJ-1@gated-at.bofh.it>
In reply to#174339
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On Tue, Nov 08, 2016 at 11:49:40AM +0100, Laurent Debian wrote:
> Hi and thanks for your ideas
> 
> Unfortunately there is no directory  /sys/class/backlight on my system.
> After a
> 
> > locate backlight
> >
> I juste had the following files as seemingly relevant.
> 
> > /var/lib/systemd/backlight/pci-0000:02:00.0:backlight:nv_backlight
> > /var/lib/systemd/backlight/platform-applesmc.768:leds:smc::kbd_backlight
> >
> Which were both at 100 but an echo 0 > ....  had no effect on the backlight
> (tough it tuned to 0 the value of in the  files )
> Any ideas where I should start to look at ?

Hm Sorry. Are you able to change backlight under X? Perhaps there are clues
to be extracted from that?

regards
- -- t
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#174346

FromLaurent Debian <laurent.debian@gmail.com>
Date2016-11-08 14:20 +0100
Message-ID<sBetH-1nU-25@gated-at.bofh.it>
In reply to#174345

[Multipart message — attachments visible in raw view] — view raw

I did not install X on this machine since the screen is half broken.  (i
just use it as a server and acces it via ssh but screen consume power for
nothing so i want somehow to turn it off).
I can install x and then try again xbacklight. This will be my next try...
Thanks again,
Laurent.

2016-11-08 14:02 GMT+01:00 <tomas@tuxteam.de>:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On Tue, Nov 08, 2016 at 11:49:40AM +0100, Laurent Debian wrote:
> > Hi and thanks for your ideas
> >
> > Unfortunately there is no directory  /sys/class/backlight on my system.
> > After a
> >
> > > locate backlight
> > >
> > I juste had the following files as seemingly relevant.
> >
> > > /var/lib/systemd/backlight/pci-0000:02:00.0:backlight:nv_backlight
> > > /var/lib/systemd/backlight/platform-applesmc.768:leds:
> smc::kbd_backlight
> > >
> > Which were both at 100 but an echo 0 > ....  had no effect on the
> backlight
> > (tough it tuned to 0 the value of in the  files )
> > Any ideas where I should start to look at ?
>
> Hm Sorry. Are you able to change backlight under X? Perhaps there are clues
> to be extracted from that?
>
> regards
> - -- t
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.12 (GNU/Linux)
>
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> MocAn0qQrgpo1XOc8IiLI0ZCRhL7uRkt
> =qHBJ
> -----END PGP SIGNATURE-----
>

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