7

I am curious how am I supposed to switch to using the nvidia card on my ubuntu 20.04 setup?

on 18.04 once installed, I could just plug in and go.. seems with 20.04 it is using both iGPU and PCI-E GPU... I see the device is here, I have nvidia-smi responding with output.. but the ubuntu gnome resolution is only going up to 1920x1080.. telling me it's using the intel iGPU off my core i7 2600K

Edit:

strangely, after reinstalling.. it now eroneously occupies the GPU even though I only get intel resolutions..

how do I revert so the iGPU is used 100% and the GPU is left freed ?

enter image description here

Erik
  • 250
  • 1
  • 6
  • 24

2 Answers2

3

This solution was given to me and tested via the NVIDIA linux forums

Essentially start the NVIDIA X Server settings:

https://forums.developer.nvidia.com/t/ubuntu-20-04-fresh-install-looking-for-how-to-use-prime-to-use-igpu-on-desktop-intel-gtx-1060/124195/2

under PRIME profiles select 

NVIDIA OnDemand

next, you need to do the following :

  • add ‘nogpumanager’ kernel parameter

See https://wiki.ubuntu.com/Kernel/KernelBootParameters if you're unfamiliar with that step

  • delete /usr/share/X11/xorg.conf.d/11-nvidia-offload.conf
  • create /etc/X11/xorg.conf with contents:
   Section "Device"
       Identifier     "intel"
       Driver         "modesetting"
       BusID          "PCI:0:2:0"
   EndSection
Erik
  • 250
  • 1
  • 6
  • 24
  • 1
    That worked, thank you! I'd just add a note explaining how to get the correct BusID, since it may be different from what you pasted. See my answer [here](https://askubuntu.com/a/1099963/803807) for instructions if you'd like to make your answer even more awesome! – stason Oct 24 '20 at 05:14
  • 1
    And the first bit is much easier to do with just `sudo prime-select on-demand` – stason Oct 24 '20 at 05:15
  • Please note that this renders nvidia-settings unusable – Vladimir Hidalgo Feb 24 '21 at 23:55
  • the step to create xorg.conf was what allowed me to switch between intel and nvidia on my Lenovo Legion 5pi. Prior to this I could only get intel to work and logging in the GDM when using nvidia just caused Ubuntu to hang. on-demand does not work for me. Even without specifying the environment variables, everything uses nvidia. – jett Feb 25 '22 at 09:13
-1

Try changing the driver in Software & Updates --> Additional Drivers.

VidathD
  • 2,594
  • 5
  • 18
  • 49
  • This doesn't work. Nvidia drivers still take over when you do this. This answer https://askubuntu.com/a/1243949/803807 solves the issue. – stason Oct 24 '20 at 05:16