Morgan was reportedly escorted outside by security personnel and fell unconscious.
His spokesperson released a statement saying the cause was a combination of exhaustion and altitude, and that Morgan sought medical attention.
Morgan posted on his Twitter page that he will be back to work on Tuesday to shoot for the series "30 Rock."
"Superman ran into a little kryptonite. The high altitude in Utah shook up this kid from Brooklyn," said his Twitter page. "Gotta thank the AMAZING medical staff and all my supporters!"
Morgan's new movie "Predisposed" was screening at the film festival.