MacBook Air in clamshell mode, Dell U2711, Displayport -> Freeze on wake from sleep
I don't remember if this problem was present before I upgraded my MBA to Lion, but now, every time I use my MBA in clamshell mode connected to a Dell U2711 via a Circuit Assembly mini DisplayPort to DisplayPort cable, the MBA freezes when I wake it from sleep. The U2711 recognizes a signal upon waking the MBA and starts to wake from sleep, but goes back to sleep after a couple of seconds. When I open the MBA's screen, it's black, sometimes with a frozen mouse pointer visible. I can hear the machine is running when I go close enough to hear the fan, but all I can do is switch it off by pressing and holding the power button for five seconds.
This happens each and every time I wake the MBA in clamshell mode when connected to the U2711. What's more is that the MBA freezes when I connect the U2711 while it's running. I can connect a Dell 3008WFP, also via the same mini DisplayPort to DisplayPort cable, and the MBA doesn't freeze. And a 2010 17-inch MBP works flawlessly on either monitor.
I've managed to find exactly 1 thread on another forum describing this exact problem:
Anyone else experiencing similar problems?
P.S.: I've checked Dell's forums and there's a sticky there stating that they don't officially test their displays with Apple "proprietary" connectors. So they're basically saying: We're including a DisplayPort connector, but, if you use it, good luck.