So I ended up getting more black screens, but they were much more rare.  I have 
been using
xrandr --fb 1280x1024 --output VGA --auto --output LVDS --off
to turn on the VGA screen and turn off the laptop's screen, and I've been 
running it with the laptop lid closed.

Now, for two days in a row, I've been leaving the laptop's screen on with just
xrandr --fb 1280x1024 --output VGA --auto
and I haven't had any black screens or flickering.  If I turn off LVDS, it 
flickers within 5 minutes.  When I turn it back on again (with the lid still 
closed), I never witness any flickering.  I'm still using the same version of 
the PPA driver that I mentioned above.

Is there something else I should try, knowing that?  Does leaving the
internal screen "on" appear to fix or not fix the problem for anyone
else?

-- 
VGA-out dies after a while on Eee 1000H
https://bugs.launchpad.net/bugs/257894
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