Blinking display when sleeping.

I just noticed this today, and a search didn't turn up any similar problems. I came back to my mbp after doing something else, and I think it had gone to sleep in power adapter mode. I just have the display sleep and not the cpu when power is connected. The display was flashing off and on at about once/sec. It returned to normal as soon as I entered anything on the keyboard. My wifes Macbook does this occasionally, too.
Anyone have any experienct with this?

Sometimes. I believe it's an interaction between the display being off, the screensaver and the screensaver password mechanism (it's used when you wake a system and it asks for your password).

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