From: Corentin Chary <corentin.chary@gmail.com>
Date: Wed, 13 Jun 2012 07:32:01 +0000 (+0200)
Subject: acpi: add a way to promote/demote vendor backlight drivers
X-Git-Tag: v3.6-rc1~48^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f838eb5bd257e8a666aa8c451058fa198df7e299;p=pandora-kernel.git

acpi: add a way to promote/demote vendor backlight drivers

Instead of adding a big blacklist in video_detect.c to set
ACPI_VIDEO_BACKLIGHT_DMI_VENDOR correctly, let external modules
promote or demote themselves when they know the generic video
module won't work.

Currently drivers where using acpi_video_unregister() directly
but:
- That didn't respect any acpi_backlight=[video|vendor] parameter
  provided by the user.
- Any later call to acpi_video_register() would still re-load the
  generic video module (and some gpu drivers are doing that).

This patch fix those two issues.

Signed-off-by: Corentin Chary <corentin.chary@gmail.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
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