Clamshell mode does not appear to work with Mountain Lion installed

Installed Mountain Lion on an 11" MacBook Air last Friday night.  Now the MBA does not work in clamshell mode at work with an external monitor.  It does not appear to wake or connect to the monitor.

sjrlexlibris wrote:
I was having the same problem.  Then I happened to plug in my external power supply and the problem went away.  In other words, I only have the problem if I am running my Macbook Pro on battery power.
Mac notebooks: How to use your computer in closed clamshell (display closed) mode with an external display
Requirements for closed display mode:
Power adapter
External keyboard, mouse, or trackpad
External display
Use these steps to enable closed clamshell (display closed) mode:
Make sure the computer is plugged in to an outlet using the AC power adapter.

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