linux-kernel - Re: [PATCH v4 0/2] Add driver for Apple gmux device

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Message-ID: <4F69CBE6.5010604@shealevy.com>
Date:	Wed, 21 Mar 2012 08:39:02 -0400
From:	Shea Levy <shea@...alevy.com>
To:	Seth Forshee <seth.forshee@...onical.com>
CC:	Matthew Garrett <mjg@...hat.com>,
	platform-driver-x86@...r.kernel.org,
	Richard Purdie <rpurdie@...ys.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/2] Add driver for Apple gmux device

Hi Seth,

On 03/16/2012 03:41 PM, Seth Forshee wrote:
> Apple laptops with hybrid graphics have a device named gmux that is used
> for switching between GPUs and backlight control. On many models this is
> the only reliable method for controlling the backlight.
>
> This series adds initial support for the gmux device, along with
> anciallary support for disabling apple_bl when the gmux device is
> detected. Initially only backlight control is supported.
>
>

I've done some basic testing on my MBP 5,3 (just setting a few 
brightness levels, nothing fancy), and it all works, so feel free to add 
my basic

Tested-by: Shea Levy <shea@...alevy.com>

if you wish. Please let me know if you need testing for future gmux 
features.

A few questions:
     * I'm using nouveau, and with the gmux I have both gmux_backlight 
and nv_backlight (which never worked) in /sys/class/backlight, is this 
expected?
     * Is there anything I can do to test the sysfs backlight interface 
besides setting the levels?
     * Besides the sysfs backlight interface, are there any other 
userspace-visible changes your driver makes that I should test?

Cheers,
Shea Levy

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