I have a laptop hooked up to a TV via HDMI. When the TV powers off, the audio output switches from HDMI to the built-in laptop speakers. This behaviour is new, as previous Ubuntu versions would always stay on the last device I chose (HDMI.) How can I control this feature so as to always have HDMI selected even when the TV is off?
Failing that, how can I disable the built-in laptop speakers so they are never available, hopefully forcing the audio output to HDMI?