In my case I had to sacrifice battery life.
Is your NVIDIA card the default, not ondemand. It must be the default
one.
My HDMI is wired through the nvidia gpu, so if it's off or low powered
it doesn't show on second display.
If your nvidia is the default and is up and running, then i'm out. and
I've been struggling with this all day. My solution (on Ubuntu 20.04) is to
downgrade to nvidia driver 435.
Change gdm3 to lightdm.
In that exact order
apt install nvidia-driver-435
apt install --reinstall lightdm ubuntu-desktop
The bug is in driver 440. Also confirmed this in Arch Linux as
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