Dennis HilkLinux diagnosticsDE

USB controllers & peripherals

PCI UHCI host-controller class

PCI UHCI is a USB 1.1 controller architecture commonly encountered on older systems and virtual machines.

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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

Class 0c0300 describes UHCI controller programming. It is deliberately different from OHCI although both can carry low-/full-speed peripherals. An emulated UHCI function need not represent physical host hardware.

This is an explicit class, transport or driver-context profile. It is not an exact numeric product match.

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

UHCI PCI glue is compiled into uhci_hcd, unlike the separately named PCI glue modules of several newer host families. Inspect the reported binding rather than inferring a module solely from naming symmetry.

  • uhci_hcd — 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 interfaces and negotiated speed

lsusb -t

This read-only usbutils query normally needs no sudo. Driver belongs to the displayed interface, while speed is the negotiated connection. Other interfaces of the same physical device may use other drivers.

Limitations & related issues

This profile does not identify a VM host, passthrough setup or a failing peripheral. Controller architecture alone cannot explain disconnects or establish available host-side USB bandwidth.

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.