Since Lion, primary monitor doesn't wake from long sleeps

Since installing Lion, my iMac doesn't wake properly from sleep when it's been off for a while.
I have two monitors and the second one wakes fine, but the main one - the iMac itself - doesn't return unless I reboot.
Any thoughts?
Thanks

Try turning off hibernation mode - run the following in terminal:
pmset -a hibernatemode 0
You'll likely need to do that from an admin account using sudo.  The reason why this happens, I think, is that you close the lid and sleep the machine while the system is in the middle of doing something (updating the hibernate sleepimage, locking the screen, etc...).  then when you open the lid, the system is still going through the close-down process and the monitor wake call gets lost in the shuffle.  turn off hibernate mode to speed things up, only turn it back on when you need it (like when you're in a situation where you'll need to switch batteries without a power cord). 

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