From mboxrd@z Thu Jan  1 00:00:00 1970
From: Matthew Garrett <mjg@redhat.com>
Subject: Re: missing acpi backlight bisected to 9661e92c10
Date: Fri, 12 Aug 2011 13:18:23 +0100
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To: Ali Gholami Rudi <ali@rudi.ir>
Cc: Andrew Morton <akpm@linux-foundation.org>, Keith Packard <keithp@keithp.com>, Michel Alexandre Salim <salimma@fedoraproject.org>, intel-gfx@lists.freedesktop.org, Ali Gholami Rudi <aliqrudi@gmail.com>, Richard Purdie <rpurdie@rpsys.net>, Chris Wilson <chris@chris-wilson.co.uk>, David Airlie <airlied@linux.ie>, Alex Deucher <alexdeucher@gmail.com>, Ben Skeggs <bskeggs@redhat.com>, Zhang Rui <rui.zhang@intel.com>, Len Brown <lenb@kernel.org>, Jesse Barnes <jbarnes@virtuousgeek.org>, Sedat Dilek <sedat.dilek@googlemail.com>, Linus Torvalds <torvalds@linux-foundation.org>, linux-kernel@vger.kernel.org
List-Id: intel-gfx@lists.freedesktop.org

On Mon, Aug 22, 2011 at 10:25:24AM +0430, Ali Gholami Rudi wrote:

> Yet, /sys/devices/virtual/backlight/acpi_video0/brightness only
> appears after the revert.  Seems something changes its behavior
> if new_bd->dev.parent is not NULL in backlight_device_register().

Well, yes, if it has a parent it won't be under /sys/devices/virtual. 
Does it appear under /sys/class/backlight ?

-- 
Matthew Garrett | mjg59@srcf.ucam.org