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

To: debian-user@lists.debian.org
Subject: how to turn off backlight in console (without any X server)
From: Laurent Debian <laurent.debian@gmail.com>
Date: Tue, 1 Nov 2016 14:22:46 +0100
Message-id: <[🔎] CAFZ7WnM_Dp=uPRQMrdY2BdTxVzYd_aZFqc11nkZCvGb8Tt4mpA@mail.gmail.com>

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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