linux-kernel - Re: Macbook Pro 5,3 Video Issues

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Message-ID: <20120321024747.GA5593@ubuntu-mba>
Date:	Tue, 20 Mar 2012 21:47:47 -0500
From:	Seth Forshee <seth.forshee@...onical.com>
To:	Shea Levy <shea@...alevy.com>
Cc:	linux-kernel@...r.kernel.org, nouveau@...ts.freedesktop.org
Subject: Re: Macbook Pro 5,3 Video Issues

On Tue, Mar 20, 2012 at 06:09:07PM -0400, Shea Levy wrote:
> Hello,
> 
> On my system (Linux 3.3, booting in EFI mode, using Nouveau with
> nouveau.noaccel=1 due to
> https://bugs.freedesktop.org/show_bug.cgi?id=27501 ), I can't figure
> out how to change the backlight or switch which of the two graphics
> cards (I have an Nvidia 9600M GT and a 9400M, both are recognized by
> nouveau but only the 9400M is ever used) Linux uses for the
> framebuffer or X uses for the output. I have
> /sys/class/backlight/nv_backlight, and writting to
> nv_backlight/brightness does change the value in
> nv_backlight/actual_brightness, but no actual screen changes occur.
> I'm using the in-tree staging version of nouveau, so I wasn't sure
> which ML this should go to.

Both of these are probably controlled by the gmux device on your
machine. I've submitted a driver that gets the backlight working [1]. I
haven't worked on the GPU muxing yet though, because the machine I'm
working with (MacBook Pro 8,2) has graphics issues under EFI boot that I
haven't had time to sort out.

Seth

[1] https://lkml.org/lkml/2012/3/16/388

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