[PROBLEM] Randomly missing audio (HDMI) - VCHI service conn error

[challenge]

Hello, I get a few seconds of missing audio while playing.
It happens sometimes one time per hour, sometimes multiple, sometimes never...

Moode 7.6.1 - RPi4 - CamillaDSP on (6ch in use) - HDMI out - Suptronics x6000 7.1 board (hdmi input not HAT, self powered)


Sound stops for like 10 seconds then it resumes. WebUI slow/unaccessible when it happens. 
Not sure if it happens between songs or randomly.
I am not using it daily. And don't remember if it happened in past. Today I updated from 7.4.x to 7.6.1 and I realized about it.

Not asking for a solution but what could it be? kernel bug?

I checked the logs and this shows up when it happens.

Code:

Jan  9 13:39:43 moode kernel: [  490.337605] bcm2835_audio bcm2835_audio: failed to close VCHI service connection (status=1)
Jan  9 13:56:08 moode kernel: [ 1474.965026] bcm2835_audio bcm2835_audio: failed to close VCHI service connection (status=1)
Jan  9 14:26:32 moode kernel: [ 3299.097855] bcm2835_audio bcm2835_audio: failed to close VCHI service connection (status=1)
Jan  9 14:36:39 moode kernel: [ 3905.743514] bcm2835_audio bcm2835_audio: failed to close VCHI service connection (status=1)
Jan  9 15:07:24 moode kernel: [ 5751.362990] bcm2835_audio bcm2835_audio: failed to close VCHI service connection (status=1)
Jan  9 15:19:27 moode kernel: [ 6473.695209] bcm2835_audio bcm2835_audio: failed to close VCHI service connection (status=1)

kern and moode logs attached as they were too long for a message.

BR

[Tim Curtis]

I thought HDMI multi channel output only worked starting with RaspiOS Bullseye ??

[challenge]

Jeez are you implying I'm running a hacked kernel?
I am asking seriously as I don't remember and I'm very surprised about it.

I though this was a vanilla image... but haven't used it for a while, so it could be.
I remember the kernel had to be hacked for the multichannel to work in past, but I thought it was added a good while ago and don't remember having to do it in the latest moode releases?? (had a brain fart, just realized the kernel doesn't change in moode updates... so it could be true!)
Let me check! 
EDIT: nah it's running stock moode kernel, no mods.

[bitlab]

@Tim Curtis hdmi multi channel with camilladsp works since camilladsp is added. Multichannel with usb is a different story.

[challenge]

Jeez are you implying I'm running a hacked kernel?

Let me check! 

Nah, kernel is stock from moode iso. Just checked.
As bitlab says it works (hdmi multi channel with camilladsp)
Tested up to 3-way stereo crossovers and it works fine.

Cannot provide any other debug info. Now it's playing (since 1hr ago), no issues.
I'll keep an eye on it.

[georgew21]

@Tim Curtis hdmi multi channel with camilladsp works since camilladsp is added. Multichannel with usb is a different story.

does moode support multi channel output to a usb dac?

[Tim Curtis]

IIRC multichannel USB audio requires Linux kernel 5.15.y branch. We may use this branch in upcoming moOde 8 release but no guarantee. Eventually though the 5.15.y branch will become the default in Raspberry Pi OS.

[georgew21]

IIRC multichannel USB audio requires Linux kernel 5.15.y branch. We may use this branch in upcoming moOde 8 release but no guarantee. Eventually though the 5.15.y branch will become the default in Raspberry Pi OS.

it will be great to have multichannel through usb, because for a 2.1 system (subwoofer + 2 spekaers) we need 3 channels to make room correction in right way with camilla.

thanks for nice work