Messages in this thread | | | Date | Mon, 29 Aug 2005 09:53:57 +0200 (CEST) | From | Oliver Neukum <> | Subject | Re: USB EHCI Problem with Low Speed Devices on kernel 2.6.11+ |
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On Mon, 29 Aug 2005, James Courtier-Dutton wrote:
> Dominik Wezel wrote: > > Problem > > ======= > > When turning on the laptop and during POST and GrUB loading, all ports on > > the hub are enabled. During the USB initialization phase, when the hub is > > detected, shortly all ports become disabled, then turn on again (uhci_hcd > > detects the lo-speed ports). Upon initialization of ehci_hcd however, the > > ports are disconnected again (for good): > > > > Use uhci_hcd or ehci_hcd, but never both at the same time. > ehci_hcd will work with all lo-speed ports, so uhci_hcd is then no needed.
What? UHCI is stand alone. EHCI will work only with high speed devices (that includes low and full speed on a high speed hub, but not directly connected devices)
Regards Oliver
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