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

[Jaroslav Kysela]

Dne 02. 02. 20 v 15:18 Martin Regner napsal(a):
> Hi Takashi,
> 
> thanks for your reply. I tried that with
> 
> cat /proc/asound/card0/codec#0
> 
> but that doesn't help. I'm digging me through the kernel config right
> now. May have to change something else.
> 
> I simply could create a patch on my gentoo system switching from
> patch_nvhdmi to patch_nvhdmi_legacy for every new kernel, but that won't
> work forever.
> 
> If you have other thinks i could try i'd appreciate to hear them.

You may try to disable PM:

echo on > /sys/bus/pci/devices/0000\:01\:00.1/power/control

				Jaroslav


> 
> kind regards
> Martin
> 
> On 02.02.20 09:37, Takashi Iwai wrote:
>> On Sat, 01 Feb 2020 16:28:08 +0100,
>> Martin Regner wrote:
>>> 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.
>> The runtime PM turns off the link, so the hotplug notification won't
>> be delivered as default.  Please try reading the corresponding proc
>> file, /proc/asound/card*/codec* file.  This may power up the codec and
>> trigger the hotplug detection if that's the cause.
>>
>>
>> Takashi
> 
> 
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-- 
Jaroslav Kysela <perex at perex.cz>
Linux Sound Maintainer; ALSA Project; Red Hat, Inc.