linux-kernel - Re: missing acpi backlight bisected to 9661e92c10

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Message-ID: <20110812121822.GA11301@srcf.ucam.org>
Date:	Fri, 12 Aug 2011 13:18:23 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Ali Gholami Rudi <ali@...i.ir>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Keith Packard <keithp@...thp.com>,
	Michel Alexandre Salim <salimma@...oraproject.org>,
	intel-gfx@...ts.freedesktop.org,
	Ali Gholami Rudi <aliqrudi@...il.com>,
	Richard Purdie <rpurdie@...ys.net>,
	Chris Wilson <chris@...is-wilson.co.uk>,
	David Airlie <airlied@...ux.ie>,
	Alex Deucher <alexdeucher@...il.com>,
	Ben Skeggs <bskeggs@...hat.com>,
	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Sedat Dilek <sedat.dilek@...glemail.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: missing acpi backlight bisected to 9661e92c10

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@...f.ucam.org
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