Subject: Re: 2.6.28 regression: xbacklight broken on ThinkPad X61s
From: Zhang Rui <rui.zhang@intel.com>
To: Tino Keitel <tino.keitel@gmx.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       "linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
       trenn@suse.de, mjg59@srcf.ucam.org
In-Reply-To: <20090105083911.GA3694@x61>
References: <20090105083911.GA3694@x61>
Content-Type: text/plain
Date: Mon, 05 Jan 2009 17:06:15 +0800
Message-Id: <1231146375.32473.52.camel@rzhang-dt>
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On Mon, 2009-01-05 at 16:39 +0800, Tino Keitel wrote:
> Hi,
> 
> xbacklight is broken as of 2.6.28 on my ThinkPad X61s. It works with
> 2.6.27(.8) The difference I can see between both kernels is that 2.6.27
> has 2 backlight ACPI devices, whereas 2.6.28 only has one device.  With
> 2.6.28, I can use xbacklight and see the values change in xbacklight
> -get, but the actual display brightness doesn't change.
> 
hmm, this regression is caused by commit 
22c13f9d8179f4c9caecfcb60a95214562b9addc

but the real problem is that the IGD OpRegion doesn't work well on this
laptop.

please file a bug at bugzilla.kernel.org and attach the acpidump there.

thanks,
rui

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