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7020100
(Get the code!)
After last Ubuntu Updates,I can watch now the HDMI/DisplayPort2, but when you go to Ubuntu Settings in Sound options (watch the screenshot attached in this comment), you can watch the HDMI/DisplayPort 2 and the config Salida Digital Estereo (Stereo Digital Output).
If you change the config Stereo to HDMI 7.1 (I only have a stereo Speakers not 7.1 speakers), the config setting disappear in the Ubuntu Settings Menu and you can't select it again and you can't change it (check the screenshot).
If you try to select HDMI/DisplayPort 2 it doesn't work because the 7.1 sound was selected and I have got a stereo speakers.
To fix it I have opened pulse audio (check the other Screenshot attached) and in the top setting, GP102 HDMI Audio set the setting "Stereo Digital Output (HDMI2)".
After that the sound was recovered.
I don't know if the correct detection of the sound cards when switching on the PC was fixed or not. You will check if this part is fixed now with the last Ubuntu Updates.
Thank you.