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Date: Tue, 26 Aug 2014 12:10:31 +0400
From: Gleb Smirnoff <glebius@FreeBSD.org>
To: Adrian Chadd <adrian@FreeBSD.org>, Henry Hu <henry.hu.sh@gmail.com>
Subject: Re: svn commit: r270516 - head/sys/dev/drm2/i915
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On Mon, Aug 25, 2014 at 05:03:10AM +0000, Adrian Chadd wrote:
A> Author: adrian
A> Date: Mon Aug 25 05:03:10 2014
A> New Revision: 270516
A> URL: http://svnweb.freebsd.org/changeset/base/270516
A> 
A> Log:
A>   i915 driver - enable opregion handle; program CADL.
A>   
A>   add opregion handling for drm2 - which exposes some ACPI video configuration
A>   pieces that some Lenovo laptop models use to flesh out which video device
A>   to speak to.  This enables the brightness control in ACPI to work these models.
A>   
A>   The CADL bits are also important - it's used to figure out which ACPI
A>   events to hook the brightness buttons into.  It doesn't yet seem to work
A>   for me, but it does for the OP.
A>   
A>   Tested:
A>   
A>   * Lenovo X230 (mine)
A>   * OP: ASUS UX51VZ

Works on Lenovo X1 Carbon! Thanks a lot, Adrian and Henry!!!

-- 
Totus tuus, Glebius.