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 <to...@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----- > >
