nouveau optimus HDMI audio support

[Dave Airlie]

On Mon, Oct 7, 2013 at 7:04 AM, Jethro Beekman <dri-devel at jbeekman.nl> wrote:
> Even with Dave Airlie's recent patch set (
> http://lists.freedesktop.org/archives/dri-devel/2013-August/042854.html ), I'm
> still having trouble getting HDMI audio to work on my optimus laptop. I'm
> running Linux 3.12.0-rc3 on a Lenovo ThinkPad T420s. When I set my BIOS graphics
> option to 'Discrete', I get the following two devices in lspci:
>
> 01:00.0 VGA compatible controller: NVIDIA Corporation GF119 [Quadro NVS 4200M]
> (rev a1)
> 01:00.1 Audio device: NVIDIA Corporation HDMI Audio stub (rev a1)
>
> When I set the option to 'Optimus', the 01:00.1 device disappears completely.
> This is dmesg when loading nouveau in the Optimus configuration:
>
> pci 0000:01:00.0: optimus capabilities: enabled, status dynamic power, hda bios
> codec supported
> VGA switcheroo: detected Optimus DSM method \_SB_.PCI0.PEG_.VID_ handle
> [drm] hdmi device  not found 1 0 1
>
> I modified snd-hda-intel to report which devices it's probing, this is the only
> one that shows up:
>
> hda-intel: azx_probe: 0000:00:1b.0
>
> Any ideas what's going on?

Wierd, I wonder does it route the codecs via the other device, though
I can't remember how to see what codecs are available.

The other thing would be to try and hack on the hdmi stub using the
code in my patches that does it after s/r but do it at startup.

Dave.

>
> Jethro Beekman
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