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SubjectRe: [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 <>

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

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
* 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?

Shea Levy

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