Dennis HilkLinux diagnosticsDE

USB controllers & peripherals

PCI EHCI host-controller class

PCI EHCI is the USB 2 high-speed host-controller family used alongside older companion controllers.

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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 0c0320 describes the EHCI programming interface. A full-/low-speed peripheral may appear under a companion controller or through a hub translator rather than as a failed EHCI device.

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

ehci_pci supplies the PCI glue and ehci_hcd the controller logic. The source also deliberately bypasses selected IDs handled by another implementation, so the generic class is a candidate rather than a forced binding.

  • ehci_pci — kernel driver/module candidate
  • ehci_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

Seeing 12M or 1.5M beside a keyboard is not a slow-drive diagnosis. EHCI does not imply SuperSpeed support; compare the specific peripheral branch before changing cables or drivers.

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.