4.9-PRE hanging on boot with USB KVM active

[Nate Lawson]

On Mon, 15 Sep 2003, Chris Pepper wrote:
> 	I have an IOGear MiniView USB KVM (probably model GCS102U,
> but I can't verify from here). It has VGA & USB connections to 2
> systems, with a VGA connector and 4-port USB hub switchable between
> the 2 hosts.
>
> 	The KVM works fine with my Mac and my HP Pavilion running
> 4.5-R through 4.9-PRE, but a newer Dell 600SC hangs if the KVM is
> 'connected' (switched over to the PC) at boot time (under 4.8-R
> through RELENG_4 as of 2003.09.10.00.00.00). If I switch to the 600SC
> after it's up, the KVM attaches and detaches properly.
>
> 	Here's what the Pavilion has to say about the KVM from dmesg:
>
> >uhci0: <Intel 82801AA (ICH) USB controller> port 0x1080-0x109f irq
> >11 at device 31.2 on pci0
> >usb0: <Intel 82801AA (ICH) USB controller> on uhci0
> >usb0: USB revision 1.0
> >uhub0: Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1
> >uhub0: 2 ports with 2 removable, self powered
> >uhub1: Texas Instruments TUSB2046 hub, class 9/0, rev 1.10/1.25, addr 2
> >uhub1: 4 ports with 4 removable, self powered

Unfortunately, I know 0 about USB in general and only do a little work on
umass(4).

-Nate