Subject: Re: hardware wireless switch and USB wireless device
To: Greg Troxel <email@example.com>
From: Steven M. Bellovin <firstname.lastname@example.org>
Date: 12/27/2007 19:03:38
On Thu, 27 Dec 2007 18:54:31 -0500
Greg Troxel <email@example.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.