Can I disable EHCI?

Alexander E. Patrakov patrakov at
Fri Dec 22 21:24:02 PST 2006

Dominic Hilsbos wrote:

> Is EHCI supposed to be compatible with USB 1.1?  Or am I right that OHCI supports that?

OHCI is for USB-1.1. EHCI is for USB-2.0, but it doesn't work without OHCI 
or UHCI. EHCI is harmless (but still prints its message to dmesg) when there 
is no USB 2.0 controller.

What you are seeing is probably a misrouted IRQ and/or buggy BIOS problem. 
Does the following boot command line work around it?

linux pci=noacpi noapic nolapic usb_handoff

Alexander E. Patrakov

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