Duplicate intel hda sound card in guest

[Fail]

Hi All, I can't understand if it is a bug of the driver o something related to Proxmox.

For testing an application, I need a sound card. I added to a debian 11 guest and audio device with:

qm set <VMID> -audio0 device=ich9-intel-hda

aplay -l

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: Generic Analog [Generic Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 0: Intel [HDA Intel], device 2: Generic Analog [Generic Analog]
Subdevices: 1/1
Subdevice #0: subdevice #0

Same thing happens in windows guest, resulting in 2 devices.

If i switch to AC97 card, only 1 card is displayed.


The problem is that launching alsamixer results in an error:

alsamixer
ALSA lib simple_none.c:1544:(simple_add1) helem (MIXER,'Master Playback Switch',0,1,0) appears twice or more
cannot load mixer controls: Invalid argument

 

[dcsapak]

can you post the complete vm config?

 

[leesteken]

The Q35 virtual motherboard has an audio device (which does nothing AFAIK) and when you add a working virtual audio devices, you end up with two. I tend to use options pci_stub ids=8086:293e inside Linux VMs to disable and hide the non-working virtual motherboard device.

 

[Fail]

can you post the complete vm config?

Fresh install of debian 11
Linux:

agent: 1
audio0: device=ich9-intel-hda
boot: order=scsi0;ide2;net0
cores: 2
ide2: local:iso/debian-11.5.0-amd64-netinst.iso,media=cdrom,size=382M
memory: 2048
meta: creation-qemu=7.1.0,ctime=1674125083
name: debian-test
net0: virtio=66:16:35:DD:AA:00,bridge=vmbr0
numa: 0
ostype: l26
scsi0: local-raid60-thin:vm-105-disk-0,cache=writeback,discard=on,iothread=1,size=32G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=3513a1bb-951b-4981-8ee2-1f8cb165c72d
sockets: 1
vmgenid: 2f90b278-989a-4eb9-b000-ad401e3fda8a

Windows:

agent: 1
audio0: device=ich9-intel-hda,driver=none
boot: cdn
bootdisk: scsi1
cores: 4
cpu: host
machine: pc-i440fx-7.1
memory: 4096
name: win10
net0: virtio=8A:17:26:72:5E:CD,bridge=vmbr2
numa: 0
ostype: win7
scsi1: local-lvm:vm-100-disk-0,cache=writeback,iothread=1,size=32G
scsihw: virtio-scsi-single
smbios1: uuid=e0a65291-b299-4640-965f-c4786b58fbf8
sockets: 1
vga: virtio
vmgenid: 111a9c64-b8d1-40d6-937d-8285f730b103

The Q35 virtual motherboard has an audio device (which does nothing AFAIK) and when you add a working virtual audio devices, you end up with two. I tend to use options pci_stub ids=8086:293e inside Linux VMs to disable and hide the non-working virtual motherboard device.

My vm motherboard is old i440fx. If i set audio device to AC97 does not happen.

lspci shows only one card.

root@debian:/home/roby# lspci
00:00.0 Host bridge: Intel Corporation 440FX - 82441FX PMC [Natoma] (rev 02)
00:01.0 ISA bridge: Intel Corporation 82371SB PIIX3 ISA [Natoma/Triton II]
00:01.1 IDE interface: Intel Corporation 82371SB PIIX3 IDE [Natoma/Triton II]
00:01.2 USB controller: Intel Corporation 82371SB PIIX3 USB [Natoma/Triton II] (rev 01)
00:01.3 Bridge: Intel Corporation 82371AB/EB/MB PIIX4 ACPI (rev 03)
00:02.0 VGA compatible controller: Device 1234:1111 (rev 02)
00:03.0 Unclassified device [00ff]: Red Hat, Inc. Virtio memory balloon
00:05.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
00:08.0 Communication controller: Red Hat, Inc. Virtio console
00:12.0 Ethernet controller: Red Hat, Inc. Virtio network device
00:1e.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
00:1f.0 PCI bridge: Red Hat, Inc. QEMU PCI-PCI bridge
01:01.0 SCSI storage controller: Red Hat, Inc. Virtio SCSI
03:0c.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)

 

[Docop2]

In order to have audio.. can it be better to passthroug the pci audio board and then install the driver in your windows10 vm ? The option of adding : ich9-intel-hda , wasn't it only to be used with spice display to get audio related, like rdp, but no have audio in the vm for something else...

 

[Fail]

In order to have audio.. can it be better to passthroug the pci audio board and then install the driver in your windows10 vm ? The option of adding : ich9-intel-hda , wasn't it only to be used with spice display to get audio related, like rdp, but no have audio in the vm for something else...

Yes, would be better.. but I have a server motherboard without integrated audio. As I said, i need an audio card to test an application that needs 5.1 or 7.1 output. For now, under linux, as a workaround I'm using a virtual dummy sound card ( snd-dummy module ) with a proper asound.conf

 

[Docop2]

using a virtual dummy sound card ( snd-dummy module ) with a proper asound.conf

That is quite interesting.. Can it be possible to share the config and setting of that asound file ?

 

[Fail]

This is quite offtopic but I'll explain better.

That is quite interesting.. Can it be possible to share the config and setting of that asound file ?

Background: what I'm trying to achieve is a DIY wireless multichannel audio setup ( sonos like ). This is possible thanks to snapcast server. Snapcast can take different sources as input as 2 channels, and send the output to clients in sync. What i'm trying to do is splitting 6 channel in 3x2 channels or 6x2 channels ( with 1 channel muted ) and writing fifo files that snapcast can use as input sources. The alsa.conf below does this but only for left/right/center channels ( i'm simulating this 2.1 setup using 3 mobile phones running snapclient ) At every speaker will be a raspberry pi with snapclient that can select the correct snapserver output.

kodi mediaplayer -> audio split to fifo files -> snapserver with multiple fifo input and output -> snapclients connected to speakers

First of all you have to load dummy driver and set options:

##debian /etc/modules

snd-dummy
snd-pcm-oss
snd-mixer-oss
snd-seq-dummy

root@nas:~# cat /etc/modprobe.d/alsa.conf
       # ALSA portion
       alias char-major-116 snd
       alias snd-card-0 snd-dummy
       # module options should go here
      
       # OSS/Free portion
       alias char-major-14 soundcore
       alias sound-slot-0 snd-card-0
      
       # card #1
       alias sound-service-0-0 snd-mixer-oss
       alias sound-service-0-1 snd-seq-oss
       alias sound-service-0-3 snd-pcm-oss
       alias sound-service-0-8 snd-seq-dummy
       alias sound-service-0-12 snd-pcm-oss

This is my alsa.conf

root@nas:~# cat /etc/asound.conf
pcm.!default {
    type plug
    slave {
        pcm rate44100Hz # Direct default output to the below converter
        channels 6
    }
}

pcm.rate44100Hz {
    type rate
    slave {
        pcm writeFile #Direct to the plugin which will write to a file
        format S16_LE
#        channels 2
        rate 44100
    }
    #route_policy copy
}


pcm.writeFile {
    type plug
    slave.pcm {
       type multi
       slaves {
         a {channels 2 pcm "chfrontleft"}
         b {channels 2 pcm "chfrontright"}
       }
       bindings{
        0 {slave a channel 0}
        1 {slave a channel 1}
        2 {slave b channel 0}
        3 {slave b channel 1}
       }
    }
    ttable [
    ##  1 2 3 4 ##

      [ 1 0 1 0 ] #Source FL  -> a.frontleft b.frontleft
      [ 0 1 0 1 ] #Source FR  -> a.frontright b.frontright
      [ 1 1 1 1 ] #Source C   -> a.center b.center
      [ 0 0 0 0 ] #Source LFE -> a.lfe b.lfe
      [ 0 0 0 0 ] #Source BL  -> a.backleft b.backleft
      [ 0 0 0 0 ] #Source BR  -> a.backright b.backright
      
    ]
}

pcm.chfrontleft {
    type file
    file "/tmp/audio/snapfifo_fl"
    format "raw"
    slave {pcm null}
}

pcm.chfrontright {
    type file
    slave {pcm null}
    file "/tmp/audio/snapfifo_fr"
    format "raw"
}
pcm.chbackleft {
    type file
    slave {pcm null}
    file "/tmp/audio/snapfifo_bl"
    format "raw"
}
pcm.chbackright {
    type file
    slave {pcm null}
    file "/tmp/audio/snapfifo_br"
    format "raw"
}
pcm.chcenter {
    type file
    slave {pcm null}
    file "/tmp/audio/snapfifo_c"
    format "raw"
}
pcm.chlfe {
    type file
    slave {pcm null}
    file "/tmp/audio/snapfifo_lfe"
    format "raw"
}




pcm.dummy {
  type hw
  card 0
}
      
ctl.dummy {
  type hw
  card 0
}