From: Keith Packard <keithp@keithp.com>
Subject: Re: [V2 PATCH 2/2] drivers-gpu-drm-i915-invert-backlight-brightness
Date: Wed, 14 Mar 2012 19:42:16 -0700
Message-ID: <8662e6inzr.fsf@sumi.keithp.com>
References: <20120314233544.629616190@osadl.org> <20120314234830.227490545@osadl.org>
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To: David Airlie <airlied@linux.ie>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Valdis Kletnieks <Valdis.Kletnieks@vt.edu>, Thomas Gleixner <tglx@linutronix.de>, Carsten Emde <C.Emde@osadl.org>, DRI <dri-devel@lists.freedesktop.org>, LKML <linux-kernel@vger.kernel.org>
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<#part sign=pgpmime>
On Thu, 15 Mar 2012 00:35:46 +0100, Carsten Emde <C.Emde@osadl.org> wrote:

> This patch adds a module parameter to invert the backlight brightness
> value before writing and after reading which makes the affected notebook
> usable again.

You should add a quirk for this and set things up so that your machine
automatically gets the right value; when we find more machines that do
this, we can add them so that more people will get a system that 'just
works'.

-- 
keith.packard@intel.com