HEADS UP: Enabling vt(4) by default

[Hans Petter Selasky]

Hi,

FreeBSD 11-current:

I had a panic, that VT tries to drain a callout while a mutex is locked 
rooting down from somewhere:

vt_late_window_switch()

When starting X11. Try to apply my kernel timeout work in progress patch 
in the new "[RFC] kern/kern_timeout.c rewrite in progress" thread and 
you will see right away.

I can get full backtrace if you can't figure this out. Just out of time 
right now.

Thank you!

--HPS