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?
Jethro Beekman