mingetty does not redraw itself upon SIGWINCH, which results in a blank
screen.
to reproduce: SVGATextMode v116x48
SVGATextMode v116x43
now look at an idle mingetty VC...
Interestingly enough, if mingetty were to die upon SIGWINCH, that would be
good enough a fix. INIT would promptly respawn the process and causing the
redraw :-)