Awesome, that looks like an acceptable solution to me.

I did a bit more experimentation, and I found that after installation
has completed (even before rebooting), the issue cannot be reproduced
using the steps I outlined.  So it is only occurring during a very
specific point of time, after /target is mounted, but before
installation has completed.  I did a `modprobe vga16fb fbcon` to turn on
the installation environment's framebuffer, but that was not sufficient,
so there is something more unique about that environment than just the
vga16fb.  I wonder if packages are in an inconsistent state or
something...  (Maybe there's  a mismatch between what's in memory and
what's on disk?)

Anyway, since I couldn't find anything more enlightening that way, I
think your patch is going to be the best way to go.  I'll roll it out
directly.  Good work!

-- 
Alternate install of Tribe-4 corrupts video display when installing packages 
(affected hardware includes Santa Rosa)
https://bugs.launchpad.net/bugs/127008
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