NVidia HDMI not an option for audio output

[Fabby]

• What does lock op the system? Playing audio or optimus-manager --switch nvidia all by itself?
• How do you get out of the lock-up? Switching back or a REISUB?

If you tell me now “By pressing the power button”, please read all of this:

[HowTo] reboot / turn off your frozen computer: REISUB/REISUO

Difficulty: ★★☆☆☆ This tutorial was created because people are using a hard power off during freezes, so this will teach you how to turn off your computer when everything is frozen using softer means. So whenever you see someone saying they had to “Power Off” or “Hard Reset” their system without doing a REISUB, please send them here! If you’re reading this in response to a question, please click the green link above this text to bring you to the full unabridged text of the tutorial…