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

[Martin Regner]

Hi Jaroslav,

thanks for the tip. I tried this (in my case echo on  > 
/sys/bus/pci/devices/0000\:09\:00.1/power/control) but that didn't help.

If i comment out the line

spec->dyn_pcm_assign = true;

in patch_nvhdmi sound is working again.

Curiously nobody else seems to have this problem. This makes me think 
the problem lies elsewhere but i have no more ideas at the moment.

On 03.02.20 00:00, Jaroslav Kysela wrote:
> 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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>
>