[alsa-devel] [PATCH v3 4/4] ALSA: hda - Add DP-MST support for NVIDIA codecs

[Martin Regner]

Hi there,

since i updated to kernel 5.5 i have no sound over hdmi anymore (GeForce 
RTX 2070).

With the previous kernel 5.4.14 everything is fine.

Although i got sound with speaker-test -D hdmi:CARD=NVidia,DEV=2 -c 2 -r 
44100, pavucontrol shows all hdmi sound devices as unplugged.

I bisected it down to this commit 
(5398e94fb753d022301825ebfa5f7cf8a660d8eb) and changed the line

HDA_CODEC_ENTRY(0x10de0093, "GPU 93 HDMI/DP",  patch_nvhdmi)

to

HDA_CODEC_ENTRY(0x10de0093, "GPU 93 HDMI/DP",  patch_nvhdmi_legacy)

Now it's working again. I'm not sure if this is a problem with 
pulseaudio or if the RTX 2070 does not support the mentioned codec.

Thanks in advance

Martin