From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <greg@kroah.com>
Subject: Re: [PATCH linux-3.1.y] ideapad: Check if acpi already handle
 backlight power to avoid a page fault
Date: Thu, 12 Jan 2012 14:59:35 -0800
Message-ID: <20120112225935.GB3360@kroah.com>
References: <CAFVLVSOp750X4L+qgR16Qc53V+jOKsxA-ujskx3K0BX9kQOzTw@mail.gmail.com>
 <20120111004256.GS22184@burratino>
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To: Jonathan Nieder <jrnieder@gmail.com>
Cc: stable@vger.kernel.org, platform-driver-x86@vger.kernel.org, Artem X <artem.brz@gmail.com>, Rene Bolldorf <xsecute@googlemail.com>, Matthew Garrett <mjg@redhat.com>, Ike Panhc <ike.pan@canonical.com>, Corentin Chary <corentin.chary@gmail.com>

On Tue, Jan 10, 2012 at 06:42:56PM -0600, Jonathan Nieder wrote:
> From: Ren=E9 Bollford <xsecute@googlemail.com>
> Date: Sun, 23 Oct 2011 09:56:42 +0200
>=20
> commit d4afc7754a60b885b63ef23fd194984e2d53a4e6 upstream.
>=20
> This patch avoid a page fault in the ideapad-laptop extras when
> turning the backlight power on or off.
>=20
> Signed-off-by: Rene Bolldorf <xsecute@googlemail.com>
> Signed-off-by: Matthew Garrett <mjg@redhat.com>
> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
> Tested-by: Artem X <artem.brz@gmail.com>
> ---
> Artem X wrote:
>=20
> > I've compiled vanilla 3.1.6 with that patch and turning off blackli=
ght
> > was working.
>=20
> This fixes an oops reported by a few people in the new ideapad-laptop
> backlight driver.  See:
>=20
>  - http://thread.gmane.org/gmane.linux.kernel/1205259
>  - http://thread.gmane.org/gmane.linux.drivers.platform.x86.devel/240=
5
>  - http://bugs.debian.org/655377
>=20
> Luckily the ideapad-laptop backlight driver was introduced in
> v3.1-rc1~14^2~29, so older kernels do not have this bug.  Fix is
> already included in v3.2.

Now applied, thanks.

greg k-h