Disconnected device still show's in audio output

Hi, i have the sound going trough an HDMI, all working fine until a system update i did today, in which it stoped working. If disconnect and reconnect the hdmi cable it now shows as another device and works. So i disconnected it and boot the computer to force it to “forget” the device, but even with nothing plugged it shows like it was something connected.


How can i totally restore the audio to forget this phantom entry? (So i have not to use another port or reconnect the tv each time)
Thank you.