From mboxrd@z Thu Jan 1 00:00:00 1970 From: Seth Forshee Subject: Re: Macbook Pro 5,3 Video Issues Date: Tue, 20 Mar 2012 21:47:47 -0500 Message-ID: <20120321024747.GA5593@ubuntu-mba> References: <4F690003.1040404@shealevy.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <4F690003.1040404@shealevy.com> Sender: linux-kernel-owner@vger.kernel.org To: Shea Levy Cc: linux-kernel@vger.kernel.org, nouveau@lists.freedesktop.org List-Id: nouveau.vger.kernel.org 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