Proxmox 7 on Raspberry Pi - Working, but no sound in LXC Container

[DaCHack]

Hi,

I am trying to use this for a Proxmox LXC on my Raspberry Pi 4 based on this solution:
https://github.com/pimox/pimox7

This works fine, but in LXC containers I get no sound. Any idea what I could do to make this work?

What I did:
- Using Proxmox 7 (Pimox7) on Raspberry Pi 4 2GB ("HyperVi")
- Setup a privileged Proxmox LXC ("MediaCenter") via the web interface using a Debian template
- On the host, aplay sees my 2 HDMI connectors as audio devices and speaker-test gives an output through the speakers
- On the LXC, aplay does not see any audio device

root@HyperVi:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: vc4hdmi0 [vc4-hdmi-0], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: vc4hdmi1 [vc4-hdmi-1], device 0: MAI PCM i2s-hifi-0 [MAI PCM i2s-hifi-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

root@MediaCenter:~# aplay -l
aplay: device_list:274: no soundcards found...

root@HyperVi:~# ls -lash /dev/snd
total 0
0 drwxr-xr-x  3 root root      180 Dec  1 22:53 .
0 drwxr-xr-x 18 root root     4.1K Dec  1 22:54 ..
0 drwxr-xr-x  2 root root       80 Dec  1 22:54 by-path
0 crw-rw----  1 root audio 116,  0 Dec  1 22:53 controlC0
0 crw-rw----  1 root audio 116, 32 Dec  1 22:54 controlC1
0 crw-rw----  1 root audio 116, 16 Dec  1 22:53 pcmC0D0p
0 crw-rw----  1 root audio 116, 48 Dec  1 22:54 pcmC1D0p
0 crw-rw----  1 root audio 116,  1 Dec  1 22:53 seq
0 crw-rw----  1 root audio 116, 33 Dec  1 22:53 timer

root@MediaCenter:~# ls -lash /dev/snd/
total 0
0 drwxr-xr-x 3 root root      180 Dec  1 21:53 .
0 drwxr-xr-x 7 root root      480 Dec  1 21:54 ..
0 drwxr-xr-x 2 root root       80 Dec  1 21:54 by-path
0 crw-rw---- 1 root audio 116,  0 Dec  1 21:53 controlC0
0 crw-rw---- 1 root audio 116, 32 Dec  1 21:54 controlC1
0 crw-rw---- 1 root audio 116, 16 Dec  1 21:53 pcmC0D0p
0 crw-rw---- 1 root audio 116, 48 Dec  1 21:54 pcmC1D0p
0 crw-rw---- 1 root audio 116,  1 Dec  1 21:53 seq
0 crw-rw---- 1 root audio 116, 33 Dec  1 21:53 timer

HDMI "soundcards" are showing in the container under proc:

root@MediaCenter:~# cat /proc/asound/cards
 0 [vc4hdmi0       ]: vc4-hdmi - vc4-hdmi-0
                      vc4-hdmi-0
 1 [vc4hdmi1       ]: vc4-hdmi - vc4-hdmi-1
                      vc4-hdmi-1

**nano /etc/pve/lxc/100.conf on the host:**

arch: arm64
cores: 2
hostname: MediaCenter
memory: 512
net0: name=eth0,bridge=vmbr0,firewall=1,hwaddr=EA:4D:1D:968:29,ip=dhcp,type=veth
onboot: 0
ostype: debian
rootfs: local:100/vm-100-disk-0.raw,size=8G
swap: 512
lxc.mount.entry: /dev/snd dev/snd none bind,create=dir 0 0
lxc.mount.entry: /dev/dri dev/dri none bind,create=dir 0 0
lxc.mount.entry: /dev/video10 dev/video10 none bind,create=file 0 0
lxc.mount.entry: /dev/video11 dev/video11 none bind,create=file 0 0
lxc.mount.entry: /dev/video12 dev/video12 none bind,create=file 0 0
lxc.mount.entry: /dev/vchiq dev/vchiq none bind,create=file 0 0
lxc.mount.entry: /dev/shm dev/shm none bind,create=dir 0 0
lxc.mount.entry: /dev/v4l dev/v4l none bind,create=dir 0 0
lxc.cgroup.devices.allow: c 116:* rwm
lxc.cgroup.devices.allow: c 243:* rwm
lxc.cgroup.devices.allow: c 81:* rwm
lxc.cgroup.devices.allow: c 160:* rwm
lxc.cgroup.devices.allow: c 13:* rwm
lxc.apparmor.profile: unconfined

 

[DaCHack]

Nobody got this working?

I saw a couple of people installing Proxmox on Pi but it seems audio and video are rarely used in LXC.

Thought about moving away from Proxmox and trying everything in Portainer/Docker. There are Dockers for all Apps I Plan for the Container (Shaireport-sync, RPiPlay, KODI).
Any opinions on that regarding feasibility?

 

[mastalee]

for proxmox7 you need to use
lxc.cgroup2.devices.allow:

this worked for me on x86 using this config: https://gist.github.com/bjoern-r/11190cbf9ab76d4835466ba49f549b0d#file-103-conf