lkml.org 
[lkml]   [2012]   [Mar]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] platform/x86: Add driver for Apple gmux device
On Mon, Mar 12, 2012 at 03:22:24PM +0000, Matthew Garrett wrote:
> On Mon, Mar 12, 2012 at 10:18:52AM -0500, Seth Forshee wrote:
>
> > Why do you presume it works under Windows? Boot camp installs a pile of
> > drivers for Windows, one of those could be a driver for the backlight. I
> > don't know either way. But it's pretty clear that MacOS is using the
> > gmux for the backlight when it is present from the reverse engineering
> > work done by others.
>
> The only reason to provide it at all is for Windows - it's never going
> to be used under OS X.

I'm not so sure. The MacBook Pro 8,1 and 8,2 seem to use the same BIOS
implementation -- the version numbers and DSDTs are identical. The 8,1
has only Intel graphics, no gmux, and a working acpi_video0 backlight
under Linux. The 8,2 has hybrid ATI/Intel, a gmux w/ working backlight
control, and acpi_video0 does not work.

So while I'm not sure, I can't rule out that the acpi_video backlight
might be provided specifically for the 8,1 and that OS X is using it.
Unfortunately I don't have an 8,1 that I can play with to try and work
it out.

Seth



\
 
 \ /
  Last update: 2012-03-12 16:43    [W:0.059 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site