Dennis HilkLinux diagnosticsDE

Virtual & unusual hardware

Virtio sound over modern PCI

A paravirtual audio function exposes guest ALSA streams while the physical audio backend remains on the host.

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On this page
  1. Overview & identity
  2. Driver & binding
  3. Firmware
  4. Read-only diagnostics
  5. Limitations & related issues
  6. References

Overview & identity

The checked modern PCI rule maps 1af4:1059 to virtio type 25 (sound). This is a virtual function identity, not the host hardware model. Transitional PCI IDs use a different subsystem-ID rule and are deliberately not inferred here.

Curated identifiers
pci 1af4:1059

A numeric match establishes a candidate family within the reviewed evidence. Marketing names, board variants, subsystem conditions and successful operation remain separate questions.

Driver & binding

virtio_snd handles type 25, not an HDA codec or USB audio interface. The guest ALSA devices and the host audio route are independent layers, even when the desktop presents them as an ordinary sound card. lspci can therefore correctly report virtio-pci while the child function is bound to virtio_snd.

  • virtio_pci — kernel driver/module candidate
  • virtio_snd — kernel driver/module candidate

Detected, bound, operational: learn the difference

Firmware

No host payload established here

No external firmware filename was established in the checked driver path. This does not describe firmware stored inside the device.

Inspect firmware packaging on your distribution

Read-only diagnostics

Run one displayed command at a time. Replace uppercase placeholders with the affected device, interface or module from your own output. Commands are never executed here. Read-only output can still contain private identifiers.

Inspect the PCI function and binding

lspci -nnk -s BDF

Replace BDF with the complete address, for example 0000:00:14.0. This read-only query needs pciutils and normally no sudo. “Kernel driver in use” is observed binding; “Kernel modules” lists candidates.

Inspect the virtio child function driver

ls -l /sys/bus/pci/devices/BDF/virtio*/driver

Replace BDF with the full observed PCI address. Read the child driver link without sudo; virtio_pci is the PCI transport, while this link belongs to the function driver. A missing child or link means that this layer was not observed.

List kernel ALSA cards

cat /proc/asound/cards

Read the current ALSA card list without sudo. Card indexes can change after reboot; an existing card does not yet establish the selected desktop output or usable wiring. A missing file can also reflect unavailable procfs/ALSA support.

Limitations & related issues

The modern PCI identity does not promise a particular rate, channel layout, latency or working host speakers. Features and stream configuration must be observed; no tested hypervisor compatibility is asserted.

These guides are linked for relevant observations, not as known defects of every device in this family.

Choose a hardware diagnostic workflow · Inspect a log excerpt in Fix Lab

References

Source review records a checked implementation or document, not a reproduced hardware test. Version-specific tables do not establish a minimum kernel or guaranteed operation.