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

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Date:	Mon, 5 Jan 2009 09:39:11 +0100
From:	Tino Keitel <tino.keitel@....de>
To:	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org
Subject: 2.6.28 regression: xbacklight broken on ThinkPad X61s

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.

Attached are 2 files with diagnostic output from 2.6.27 and 2.6.28. Any
hints how to solve or debug this?

Regards,
Tino


View attachment "backlight_2.6.27" of type "text/plain" (2426 bytes)

View attachment "backlight_2.6.28" of type "text/plain" (1679 bytes)