linux-kernel - Re: 2.6.28 regression: xbacklight broken on ThinkPad X61s

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Message-Id: <1231146375.32473.52.camel@rzhang-dt>
Date:	Mon, 05 Jan 2009 17:06:15 +0800
From:	Zhang Rui <rui.zhang@...el.com>
To:	Tino Keitel <tino.keitel@....de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	trenn@...e.de, mjg59@...f.ucam.org
Subject: Re: 2.6.28 regression: xbacklight broken on ThinkPad X61s

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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