On Wed, Nov 06, 2002 at 09:33:16PM +0000, Josef Karthauser wrote:
> On Wed, Nov 06, 2002 at 01:00:43PM -0800, Maksim Yevmenkin wrote:
> > Bernd,
> > > > Who owns USB code in -current? I need an USB expert advice
> > > > on the FreeBSD specific USB problem. Basically whenever i
> > > > put my laptop into docking station and try to plug Bluetooth
> > > > USB dongle i get
> > > >
> > > > uhub1: device problem, disabling port 1
> > > 
> > > Is you usb hub really self powered as it claims to be?
> > > If it is not the problem you are seeing is not surprising.
> > 
> > the hub (the TI one) is the inside docking station. i've
> > no idea if its self powered or not. how can i check it?
> > 
> 
> If it's inside the docking station I would assume that it's powered.

Agreed - I had overread this detail.

> On my machine with an external hub I do get messages about power budget
> being exceeded so it's probably not that.

That's a design issue.
Some ports implement overcurrent protection by self healing fuses.
Others do not even that.
I've seen many awfull cheap implementations.

Btw.:
I had seen similar problems with a self build device on some ports.
It turned out to be a problem with the device oscillator to not
properly work under some conditions.

-- 
B.Walter              COSMO-Project         http://www.cosmo-project.de
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