On Mon, 29 Aug 2005, Jan De Luyck wrote:
> On Monday 29 August 2005 01:16, 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.
>
> This seems to be in contrast with what hotplug does automatically: it loads
> both ehci_hcd and uhci_hcd here. If I don't load uhci_hcd, lo-speed devices
> do not work.
Right. EHCI is high-speed only. It needs a companion controller
and driver for low- and full-speed devices.
--
~Randy
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