White flash when wake from sleep

Just upgraded my 2007 iMac to ML. Notice that when I wake from sleep there's a white flash, or perhaps a bit longer, on screen before the desktop appears. It's similar to the white screen when booting, just before the worm gear appears.
Anyone else notice it? Normal behavior?

Yes, on a mid-2011 MacBook Air. Tried resetting SMC, no luck. I've installed all the prior firmware updates. It only happens when running on battery power. I'm going to experiment with disabling Power Nap when running on battery to see if that makes a difference.

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    Re: Open PowerBook without Wakening up from Sleep?
    Posted: Nov 20, 2005 4:44 AM in response to: Mightdancer
    Reply Email
    Hi Mightdancer --
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