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From: Erich Dollansky <erichfreebsdlist@ovitrap.com>
To: freebsd-x11@freebsd.org
Date: Thu, 12 Jul 2012 16:53:31 +0700
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Message-Id: <201207121653.32046.erichfreebsdlist@ovitrap.com>
Cc: SicoSico <resuscitated_wael@hotmail.com>
Subject: Re: Lenovo Y570 backlight
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Hi,

On Thursday, July 12, 2012 04:26:43 PM SicoSico wrote:
> Hi,
> I have Lenovo Y570 which uses 2 graphics cards, nvidia and intel. There is
> currently no way to choose nvidia from BIOS. I can choose to have both or
> intel only.
> I am using FreeBSD HEAD and I have a problem with the screen backlight, it
> is always at maximum.
> I am using intel driver x11-drivers/xf86-video-intel
> 
> /etc/make.conf
> WITH_NEW_XORG
> WITH_KMS
> 
> I tried the following with no result:
> 
this works on an X220:

acpi_call -p '\VBRC' -i $value

But you need to install acpi_call first.

Erich