When the hardware wakes from sleep, the X server does not redraw the screen. The screen is left grey until windows are moved to cause parts of it to be redrawn. This is a problem both in Quartz and IOKit modes. (A workaround in Quartz mode is to switch to the Mac OS X desktop and then back again.) This problem is typically observed on laptops as Mac OS X Public Beta only seems to support true hardware sleep on these models.
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