lkml.org 
[lkml]   [2005]   [Aug]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: USB EHCI Problem with Low Speed Devices on kernel 2.6.11+
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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-08-29 16:44    [W:0.168 / U:1.776 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site