OK, so I finally gave in and took my MBP back to the store. This does not seem to be a very common problem; the tech who was working on my unit showed the photo of the problem to all of the other folks at the genius bar and nobody else had heard of it. It apparently also does not yet exist in Apple's internal knowledge base (or some sort of "emerging issues" wiki that they also apparently have). Anyway, they were happy to replace it after doing some poking around. It seemed to help that the computer was only a day old.
So far, I've been going for one day without any problems (though it admittedly took about 3-4 days before the problem first appeared).
On the chance that it might be a software/driver/firmware-triggered issue, I think we should still try to collect information about other settings and programs that might be related:
If you are experiencing this problem, would you mind posting to the thread with the following info?
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1) Do you have any virtualization software installed (VMware, Parallels)? If so, which one? Was it in use at the time the issue occurred? If not immediately in use, had you used it since your last full reboot? (In a previous life, I used a Th
nkpd laptop that sometimes exhibited weird problems after running a VMware session, even after the session was shut down.)
2) What brightness setting do you typically use for the display? (Full, 7/8th, etc.)
3) Under System Preferences -> Energy Saver -> Options, what is your setting for:
* Automatically reduce brightness of the display before display sleep (ON or OFF)
4) Under System Preferences -> Display , what is your setting for:
* Automatically adjust brightness as ambient light changes
Thanks! If it's not an out-and-out hardware bug, maybe we can figure this out together.