I will report that I also tried in 20.04 -- Kubuntu, Ubuntu (GNOME), and XFCE (as well as my main system MATE) and can report the same behavior (no poweroff of nvidia card by default even in intel mode).
I will report that I also tried in 20.04 -- Kubuntu, Ubuntu (GNOME), and XFCE (as well as my main system MATE) and can report the same behavior (no poweroff of nvidia card by default even in intel mode).