USB support + Supermicro IPMI KVM = no keyboard

Bernd Walter ticso at
Tue Jan 29 07:04:36 PST 2008

On Tue, Jan 29, 2008 at 01:46:42PM -0000, Steven Hartland wrote:
> ----- Original Message ----- 
> From: "Max Laier" <max at>
> On Tuesday 29 January 2008, Steven Hartland wrote:
> >>So two questions:-
> >>1. Can usb support be disabled from the loader?
> >>2. Anyone got any ideas why USB would break the IPMI keyboard?
> >
> >You could try hint.kbdmux.0.disabled="1" - see kdbmux(4) for details.
> Thanks for the idea Max no go unfortunately, also tried:-
> hint.usb.0.disabled=1
> hint.uhci.0.disabled=1
> hint.ohci.0.disabled=1
> hint.ukbd.0.disabled=1

Maybe the keyboard is done via USB and the BIOS sets legacy support
for USB keyboards, which is disabled by USB drivers to handle it
You have to know that USB controllers can emulate the old 8042 driven
keyboards in hardware, but this won't allow using other USB devices
at the same time.
As long as FreeBSD isn't touching the USB controller the emulation
would be kept.
You should take a lock into the BIOS setup if you can change USB
keyboard legacy support.
And you should lock into boot messages if there is a non working USB
device found.
The USB legacy thing is just an assumption - it could be something
completely different as well.

bernd at           info at            support at

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