-----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-----
