Ubuntu 22.04, cannot use external nvidia GPU to render application, on laptop with integrated + dedicated nvidia GPU

I have a laptop running Ubuntu 22.04 with in it intel HD graphics and a discrete nvidia (Quadro M2000M) card, and I'm trying to use an external GPU setup with it (RTX 3060), however I cannot find how to configure my system to allow selecting the eGPU setup to start apps: using switcherooctl launch or __GLX_VENDOR_LIBRARY_NAME=nvidia __NV_PRIME_RENDER_OFFLOAD=1 to select a different card will always result in the system using the dedicated M2000M instead of the external RTX 3060.

I have tried also using the egpu-switcher tool, but any solution which creates a xorg.conf file in /etc/X11/ will prevent the OS from loading X until said xorg.conf file is deleted.

lspci |grep VGA correctly detects the cards

00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)01:00.0 VGA compatible controller: NVIDIA Corporation GM107GLM [Quadro M2000M] (rev a2)0a:00.0 VGA compatible controller: NVIDIA Corporation GA106 [GeForce RTX 3060 Lite Hash Rate] (rev a1)

nvidia-smi -l 1 shows the card correctly as well

+-----------------------------------------------------------------------------+| NVIDIA-SMI 510.73.05    Driver Version: 510.73.05    CUDA Version: 11.6     ||-------------------------------+----------------------+----------------------+| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC || Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. ||                               |                      |               MIG M. ||===============================+======================+======================||   0  Quadro M2000M       Off  | 00000000:01:00.0 Off |                  N/A || N/A   44C    P8    N/A /  N/A |    259MiB /  4096MiB |      0%      Default ||                               |                      |                  N/A |+-------------------------------+----------------------+----------------------+|   1  NVIDIA GeForce ...  Off  | 00000000:0A:00.0 Off |                  N/A ||  0%   44C    P8    18W / 170W |      1MiB / 12288MiB |      0%      Default ||                               |                      |                  N/A |+-------------------------------+----------------------+----------------------+

similar result with switcherooctl

Device: 0  Name:        Intel® HD Graphics 530  Default:     yes  Environment: DRI_PRIME=pci-0000_00_02_0Device: 1  Name:        NVIDIA Corporation GM107GLM [Quadro M2000M]  Default:     no  Environment: __GLX_VENDOR_LIBRARY_NAME=nvidia __NV_PRIME_RENDER_OFFLOAD=1Device: 2  Name:        NVIDIA Corporation GA106 [GeForce RTX 3060 Lite Hash Rate]  Default:     no  Environment: __GLX_VENDOR_LIBRARY_NAME=nvidia __NV_PRIME_RENDER_OFFLOAD=1

However, running for example switcherooctl launch -g 2 glxgears will run the command on the dedicated gpu, not on the external one.

I am also able to successfully use the external card as render device on blender, but I am unable to run any other application with it.

Anybody found a way to configure the system to be able to use the external GPU for running applications?