I'm using :
ubuntu 20.04, gnome 3.36.4, NVIDIA® GeForce® GTX 1050 and Intel UHD Graphics 630.
I 've installed Nvidia-driver-435 till about a month ago and now Nvidia-driver-450 but the graphic card that I can see on gnome information GUI is set as llvmpipe (LLVM 10.0.0, 256 bits) instead of nvidia graphics o Intelgraphic card.
I 'm not able to adjust screen resolution setting that is fixed is only 3840x2160 (16:9) and I cannot even use Intel UHD Graphics 630.
I 've tried also using noveau drivers some week ago but also in that case the screen resolution was fixed to 3840x2160 (16:9)
Input:
:~$ prime-select query
Output:
nvidia
Also if I want to switch to intel internal card I can see on gnome customizzation info gui is set as llvmpipe
Input:
:~$ sudo prime-select intel
Output:
Info: selecting the intel profile
gnome infos about graphic card
Input:
:~$ DRI_PRIME=0 glxinfo | grep "OpenGL renderer"
Output:
OpenGL renderer string: llvmpipe (LLVM 10.0.0, 256 bits)
Input:
:~$ DRI_PRIME=1 glxinfo | grep "OpenGL renderer"
Output:
OpenGL renderer string: llvmpipe (LLVM 10.0.0, 256 bits)
Input:
:~$ glxinfo | grep renderer
Output:
GLX_MESA_multithread_makecurrent, GLX_MESA_query_renderer,
GLX_EXT_visual_rating, GLX_MESA_copy_sub_buffer, GLX_MESA_query_renderer,
Extended renderer info (GLX_MESA_query_renderer):
OpenGL renderer string: llvmpipe (LLVM 10.0.0, 256 bits)
Input:
:~$ nvidia-smi
Output:
NVIDIA-SMI has failed because it couldn't communicate with the NVIDIA driver. Make sure that the latest NVIDIA driver is installed and running.
sudo ubuntu-drivers install
& restart fixed the problem.