ukbd: short freeze when activating LEDs

[Stefan Ehmann]

On Saturday 05 September 2009 20:29:29 Ed Schouten wrote:
> * Hans Petter Selasky <hselasky at c2i.net> wrote:
> > On Saturday 05 September 2009 16:32:55 Stefan Ehmann wrote:
> > > Whenever I press capslock/numlock, the system shortly (< 0.5 ms)
> > > freezes.
> >
> > It might also be because the USB keyboard driver is using Giant, which
> > can be congested.
> 
> For half a second? I experience the same issue. I also have the same
> issue with the Syscons VGA driver when switching windows. Some time ago
> I talked about this with some other people and it may be possible it has
> something to do with SMIs. Not sure...
> 

Recently, I got an off-list response pointing me the "Other" section of
http://wiki.freebsd.org/BugBusting/Commonly_reported_issues:
"When switching consoles (e.g. Alt-F2 to switch to ttyv1), a 2-3 second delay 
is experienced"

The suggested workaround (hint.kbdmux.0.disabled="1") also helps in my case. 
So it's not necessarily USB-related.