console no responding to key in.

Polytropon freebsd at
Fri Apr 16 14:26:19 UTC 2010

On Thu, 15 Apr 2010 14:15:24 -0700, Chuck Swiger <cswiger at> wrote:
> On Apr 15, 2010, at 1:26 PM, Jessie Xu wrote:
> > I must fix the problem since I need console login with root. Any insight
> > on this? thanks.  Our machines are Dell PowerEdge 2650 (2U rack mountable) , come with
> > Video port, PS2 keyboard/Mouse ports, and two Serial ports. -- I also
> > tried the serial ports for console access, no lucky.
> PS/2 isn't a hot-pluggable interface.  On older hardware, you
> can blow a fuse on the motherboard by trying to do so while the
> machine is on, although newer equipment uses a polyfuse (aka
> PPTC or resettable fuse) to avoid permanent damage.

An important advice!

> If there was no keyboard there initially, then the hardware
> may never attempt to use one added later, short of a power-cycle. 

If there was no atkbd: at boot time, attaching it later on
will not introduce it to the system. As you said, Chuck,
it may even destroy hardware to try to do so, leading to
the fact that you have a server with *no* AT keyboard at
all. I've already seen that with older systems not using
a resettable fuse.

> In such cases, trying a USB keyboard instead might work better.

Jessie Xu initially said he was on FreeBSD 4. If I remember
correctly,  what you suggest isn't possible in the default
configuration. Maybe a USB keyboard will be detected, causing
a ukbd: message in the log, but that's all - no input from it.
You need to type "kbdcontrol -k <device>" to switch over
from the default AT keyboard to the USB keyboard, there's
no kbdmux in 4.

As for servers, trying to connect via serial console seems
to be the standard way. Otherwise, attach keyboard and monitor
to the system while the power is off. REALLY OFF (pull mains
plug to be really sure - see PS/2 defect mentioned above).

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

More information about the freebsd-questions mailing list