On Wed, 22 Nov 2006, Steve Bangert wrote:

> Alan,
> I'm getting kernel error messages on my newly installed fc6 system when
> using a usb2 external hub, this occurs with both the fedora kernel or a
> vanilla kernel. dmesg logs are attached, errors messages start
> at around line 397. Any suggestions?

Those errors arise because your system loads uhci-hcd before ehci-hcd.  
You can change the load order to get rid of the errors, or you can just 
ignore them.

Here's what happens.  When uhci-hcd loads, the USB core sees your
high-speed hub and begins to initialize it.  A few moments later ehci-hcd
loads, and it switches the port connection away from the UHCI controller
over to the EHCI controller.  As a result uhci-hcd isn't able to
communicate with the hub any more -- that's what the error messages are
reporting.  But ehci-hcd is able to communicate with it perfectly well.

Alan Stern

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