Hackintosh HDMI matters

[gengstapo]

Hello

I need help with my Latitude 3480, cpu i5 7200u
I got this problem like when i reboot (lid is closed) my laptop while connect to hdmi it will display to the external monitor which seems ok
On random occasion where i need to open my lid, there is no display but external monitor
I have to reconnect the hdmi or open & close the lid for few times then only it trigger display to the internal display
Sometimes, while the hdmi still connected, the audio went to the internal speaker
Could help me fix this?

Thx