linux-kernel - Re: [PATCH] i915: Quirk out disconnected backlight

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Message-ID: <CACxGe6u0+LC4G-87PsEK3ys7qqeJ2WnqnCdaegMK7=M9xpA8ug@mail.gmail.com>
Date:	Fri, 14 Sep 2012 14:09:43 +0100
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	David Airlie <airlied@...ux.ie>,
	Matthew Garrett <mjg@...hat.com>,
	David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH] i915: Quirk out disconnected backlight

On Fri, Sep 14, 2012 at 2:01 PM, Chris Wilson <chris@...is-wilson.co.uk> wrote:
> On Fri, 14 Sep 2012 13:57:06 +0100, Grant Likely <grant.likely@...retlab.ca> wrote:
>> Some platforms (for instance MacbookPros) have custom backlight drivers
>> and don't use the integrated i915 backlight control. This patch adds a
>> quirk to disable registering the intel backlight when unused on a
>> platform.
>>
>> Tested on MacbookPro8,3. Without this patch both the intel_backlight and
>> gmux_backlight devices get registered and userspace doesn't know which
>> it should use.
>
> Userspace is informed throught the backlight/type property.

Perhaps, but userspace (Ubuntu) isn't doing anything with it, and it
still remains that it makes no sense whatsoever to register a
backlight device that doesn't exist.

g.

> -Chris
>
> --
> Chris Wilson, Intel Open Source Technology Centre



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
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