Dennis HilkLinux diagnosticsDE

Virtual & unusual hardware

Virtio input over modern PCI

A virtual input function receives host-provided event capabilities rather than a USB keyboard model.

Editorial source review: Share public profileOpen in the identification tool
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 1af4:1052 to virtio type 18 (input). 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 1af4:1052

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_input matches type 18 and constructs input capabilities from the device configuration. The same guest protocol can expose keyboard, pointer or absolute-coordinate input; the PCI pair does not choose one retail device. lspci can therefore correctly report virtio-pci while the child function is bound to virtio_input.

  • virtio_pci — kernel driver/module candidate
  • virtio_input — 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.

Inspect input handlers and capabilities

cat /proc/bus/input/devices

This reads the input registry without sudo and does not capture keystrokes. Names, handlers and bus information help associate event nodes with hardware; a device entry alone does not prove desktop routing or correct calibration.

Limitations & related issues

A function match cannot prove key layout, screen coordinate mapping or host focus routing. The input registry is metadata; no keystrokes are captured as part of these checks.

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.