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Press Xfinity button. Right arrow 6 or 7 times to the gear (i.e. Settings).
Go to the 9th choice down - "Comcast Labs". There, the 3rd choice is "HDMI Link". Press OK to toggle that setting to OFF.
Go back up the menu to Settings, then down to the 3rd choice - "Device Settings". There, go down to the 6th choice - "Preferences". In there go to the choice called "Power Saver Starts After". In there, select "OFF".
The above combo seems to work for us.