Power-flickering Apple Cinema Display in Ubuntu 12

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http://serverfault.com – Web search hasn't turned up anything diagnostic for this. User has a 2008-era 30" Apple Cinema Display with a newer workstation running Ubuntu 12.04. Video card is GeForce GTX 550 Ti. Keyboard and mouse are Apple, plugged into the USB2 port on the back of the monitor. Problem: the system will sometimes power down the screen randomly. Worse, when the system sleeps overnight, the monitor can't start properly the next morning - the keyboard or mouse or power button on the Cinema Display all wake up the monitor into a "flashing" state, where it turns off and on again about once every half- (HowTos)