nouveau optimus HDMI audio support

[Jethro Beekman]

On 06-10-13 15:00, Dave Airlie wrote:
> 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.

/proc/asound/card0/ lists only a single codec which is for analog i/o.

> 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.

Could you be a little more specific? I tried moving nouveau_get_hdmi_dev() later
so we have drm->device setup and then adding the 'do magic' nv_mask() call
before that. That's either not working or something more needs to happen to make
it work.

Jethro

> 
> Dave.
> 
>>
>> Jethro Beekman
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>