Just stumbled upon this article which notes bugs in the video card
driver in OSX 10.7 which can cause some machines to have issues waking
from sleep and other odd behavior. I wonder if this is the cause of some
of the hard to reproduce and/or random VO issues folks have been running
into. Apparently this affects 2010 MacBook Pros running Core i5 and i7
processors and some iMacs. They also note a way to force your machine to
always use the non-Nvidia graphics.
http://reviews.cnet.com/8301-13727_7-20083947-263/some-lion-users-plagued-by-black-screen-bug/
CB
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