HDMI and Mark1 native interface seem not cooperating

Hi, I observed that when I start Mark 1 with HDMI cable inserted, it does not activates the speaker, the microphone and the “face” (but a correct video signal is present), while if I insert the HDMI cable after a boot (AKA speaker, mic and face working) then the HDMI cable does not send the info to the screen.
Is that somehow normal?
Thank you.

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