From: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Date: Thu, 19 Jul 2007 02:45:43 +0000 (-0300)
Subject: ACPI: thinkpad-acpi: allow use of CMOS NVRAM for brightness control
X-Git-Tag: v2.6.23-rc1~17^2~5^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=24d3b77467b6aaf59e38dce4aa86d05541858195;p=pandora-kernel.git

ACPI: thinkpad-acpi: allow use of CMOS NVRAM for brightness control

It appears that Lenovo decided to break the EC brightness control interface
in a weird way in their latest BIOSes.  Fortunately, the old CMOS NVRAM
interface works just fine in such BIOSes.

Add a module parameter that allows the user to select which strategy to use
for brightness control: EC, NVRAM, or both.  By default, do both (which is
the way thinkpad-acpi used to work until now) on IBM ThinkPads, and use
NVRAM only on Lenovo ThinkPads.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
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