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From: John Baldwin <jhb@freebsd.org>
To: Adrian Chadd <adrian@freebsd.org>
Subject: Re: svn commit: r270516 - head/sys/dev/drm2/i915
Date: Mon, 25 Aug 2014 12:40:47 -0400
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On Monday, August 25, 2014 05:03:10 AM Adrian Chadd wrote:
> Author: adrian
> Date: Mon Aug 25 05:03:10 2014
> New Revision: 270516
> URL: http://svnweb.freebsd.org/changeset/base/270516
> 
> Log:
>   i915 driver - enable opregion handle; program CADL.
> 
>   add opregion handling for drm2 - which exposes some ACPI video
> configuration pieces that some Lenovo laptop models use to flesh out which
> video device to speak to.  This enables the brightness control in ACPI to
> work these models.
> 
>   The CADL bits are also important - it's used to figure out which ACPI
>   events to hook the brightness buttons into.  It doesn't yet seem to work
>   for me, but it does for the OP.

FWIW, on my Lenovo X220, this completely fixes the brightness buttons both in 
and out of X once i915kms is loaded.

-- 
John Baldwin