Retina MBP: External screen doesn't wake up

Using thunderbolt to DVI, I'm seeing that maybe 10-20% of when my screen has gone to sleep, I can't bring it back alive by pressing my keyboard.
Unplugging thunderbolt and connecting it in the other thunderbolt, next to the other one, always works.
Any ideas?

Try this:
When you put your Mac to sleep, wait for the external monitor to show "no signal" or go black. Then switch the monitor off.
Then, before you wake up your Mac, switch the monitor back on, then wake up your Mac. This is clearly some sort of Apple Thunderbolt/DisplayPort problem. I have seen this problem occurring with Apple's own Thunderbolt-to-DVI adaptor as well.
There are at least 20 threads in here with similar Thunderbolt/DisplayPort problems.

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