Questions[nouveau](ubuntu)

Hi I am trying to use Ubuntu-Prime for ubuntu 18 on an asus laptop with 2 GPU (intel & nvidia).

I found the power consumption of the computer to be way too high when I reboot with only the intel GPU (using prime-select intel or using nvidia-settings).

I found that the nouveau driver was loaded despite normally not used:

$ gpu-manager | grep nouveau
Is nouveau loaded? yes
Is nouveau blacklisted? yes
Skipping "/dev/dri/card1", driven by "nouveau"
Skipping "/dev/dri/card1", driven by "nouveau"
Found "/dev/dri/card1", driven by "nouveau"
Skipping "/dev/dri/card1", driven by "nouveau"

I tried to blacklist it and also have a kernel startup option to prevent nouveau from being loaded yet it still loads. This seems very un-linuxy to me.

Running ubuntu 18.04 with nvidia-driver-390. How can I switch to nouveau and make the change persistent between reboots?

I'm looking at different Nvidia cards and would like to know which are supported by the nouveau driver - is there a list of these available and the levels of support offered?

Is it possible to switch between Nvidia's BLOB and Nouveau video drivers on-the-fly?

I think I need to be able to:

1. [✓] Unload nvidia
2. [✓] Unload nouveau
3. [✕] Restore the console after unloading nouveau*
4. [✓] Swap xorg.conf files
5. [✓] Take care of blacklisting
6. [✓] Deal with libglx.so

*) After a bit of talk with the guys at #nouveau, it seems to be difficult or even impossible with the current Ubuntu setup (builtin vesafb). I'm trying to get it to work with uvesafb, but for now the scripts in the answer do what I was looking for.

I've installed nVidia driver successfully but I want to go back to Nouveau driver and eliminate any xorg.conf file created by nVidia config tools.

What is the proper way to do it? (not ending up with no driver at all, or no X server)