linuxaudio.org

> The idea is to use the uhci_hcd (USB1) driver instead of ehci_hcd

quoted text
> (USB2). -- Maybe the module is not loaded?

You do not have a UHCI controller.  You only have EHCI controllers.

On your machine, all USB 1.1 is handled by transaction translators in

your EHCI controller's root hub.
The UHCI driver is not a USB 1.1 driver-- it's a driver for UHCI

hardware which happens to be for USB 1.1, and which you do not have at

all.  Older machines paired a UHCI and EHCI controller to handle USB

1.1 and 2.0; newer machines use EHCI for both.
The linux EHCI TT scheduler is not very good.  I wrote a new one from

scratch a few years ago, but the kernel people considered it low

priority and I got sick of maintaining it against updates, as they

dropped it from testing kernels whenever any other incoming patch

conflicted. OTOH, the EHCI hardware itself is much more reliable than

the UHCI hardware, which apparently suffers from isochronous dropouts

even when the driver functions perfectly.
Monty

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