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Date: Mon, 23 Jul 2012 11:37:18 +0100
From: Alan Cox <alan@linux.intel.com>
To: Anisse Astier <anisse@astier.eu>
Cc: Josh Boyer <jwboyer@redhat.com>, kernel-team@fedoraproject.org,
        Dave Airlie <airlied@redhat.com>, dkline@redhat.com,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: Re: gma500 opregion/power init order backtrace
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> What I meant is: although these keycodes are already sent by acpi
> driver code, is it up to userspace to figure out which backlight
> driver to use, or should the kernel modify brightness in psb-bl
> directly ?

I'm not sure how its all glued together. I need to find out some day !