USB 2.0 with bogus Data Rate

[Bernd Walter]

On Tue, Mar 22, 2005 at 10:13:57AM +0100, Gary Jennejohn wrote:
> 
> Bernd Walter writes:
> > On Mon, Mar 21, 2005 at 11:42:40PM +0000, Carlos Silva aka|Danger_Man| wrote:
> > > Here is the rate:
> > > 
> > > osiris# dd if=/dev/da0 of=/dev/null bs=64k
> > > ^C16+0 records in
> > > 16+0 records out
> > > 1048576 bytes transferred in 14.741515 secs (71131 bytes/sec)
> > > osiris#
> > 
> > Are you shure that the device is really a high speed one?
> > USB 2.0 doesn't explizitly mean this.
> > In the list below it looks like the device is handled by an VIA
> > uhci controller - that is definitivley full speed only.
> > usbdevs -v will show you details about the current detection.
> > Moreover VIA controllers are known to cause problems.
> > But it's even much too slow for full speed.
> > There must be something elese - e.g. an IRQ problem.
> > The best choise would be to replace the controller with an NEC based
> > one.
> > 
> 
> Could also be a setting in the BIOS. Mine lets you choose between
> USB 1 and USB 2 speeds for the EHCI controller.

The ehci can only do high-speed and the uhci companion only full and
low speed.
The BIOS is broken if it speaks about full (or low) speed on EHCI.

> I have: ehci0: <VIA VT6202 USB 2.0 controller>

Yes - but you device is not attached to your ehci controller.

-- 
B.Walter                   BWCT                http://www.bwct.de
bernd at bwct.de                                  info at bwct.de