Keyboard and mouse input becomes unresponsive after choosing "Power saving" mode on MacBookAir4,1

[jckarter]

I experimented with enabling "Power saving mode" in the ProcessController replicant's system menu. The system runs normally for a bit, but after a minute or so event handling for keyboard/mouse input appears to get gummed up; the system responds to keypresses after a long delay and acts as if the key was held down for several seconds, and the mouse only moves in small increments every minute or so, and I have to force shutdown the system because not even the power key is responded to.