On Thu, 27 Dec 2007 18:54:31 -0500
Greg Troxel <gdt@ir.bbn.com> wrote:

> How is ugensa attached?  On cardbus EVDO cards, there's
> ohci/uhub/ugensa, and I get the impression that the evdo chip has the
> ochi builtin.

ucom0 at ugensa0 at uhub4 at usb4 at uhci3; the latter is a companion
controller (along with uhci2 and uhci4) to ehci1.
> 
> Does the switch actually disable the devices, or is it interpreted by
> the OS?

I don't know.
> 
> On some thinkpads I've used, the bluetooth disable (fn-f5?) seemed to
> power on and off the bluetooth usb device, causing it to detach and
> reattach much like it was physically unplugged.
> 
Of course, when I tried to reproduce the exact dmesg messages, I find
that it is doing the right thing...  (Well, mostly -- wpi0 needed to be
ifconfig'd up.  Again, that should happen automatically, but at least I
know the command there...)  But the results of this test suggest that
it is indeed a power down/power up sequence.