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How to move Ubuntu 22.04 remote desktop daemon off NVIDIA GPU and to another video card?

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I am repurposing an old Dell Precision T7910 workstation for machine learning with CUDA on NVIDIA Titan X GPU. I did a clean install of Ubuntu 22.04 LTS followed by nvidia driver installation from Ubuntu Software & Updates -> Additional Drivers. Next, I installed the CUDA toolkit from NVIDIA.

There is another video card in this system - an AMD Radeon Pro WX 3100. I use this Radeon card for display. I don't want any display related workload on the NVIDIA Titan X.

See the nvidia-smi command output below.

+---------------------------------------------+
| NVIDIA-SMI 520.61.05    Driver Version: 520.61.05    CUDA Version: 11.8     |
|-------------------------------+----------------------+----------------------+
| 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  NVIDIA GeForce ...  On   | 00000000:03:00.0 Off |                  N/A |
| 25%   30C    P8    13W / 250W |    127MiB / 12288MiB |      0%      Default |
|                               |                      |                  N/A |
+-------------------------------+----------------------+----------------------+
                                                                               
+---------------------------------------------+
| Processes:                                                                  |
|  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
|        ID   ID                                                   Usage      |
|=============================================================================|
|    0   N/A  N/A     19173      G   /usr/lib/xorg/Xorg                  3MiB |
|    0   N/A  N/A     19431    C+G   ...ome-remote-desktop-daemon      117MiB |
+---------------------------------------------+

Notice that there are two display related tasks running on the NVIDIA Titan X GPU - Xorg and Remote Desktop daemon. I want to move these processes from the NVIDIA GPU to the Radeon video card. Why are these process running on the NVIDIA card? And how do I go about moving them to the Radeon card?

Relevant sections of the lspci -k output are shown below.

03:00.0 VGA compatible controller: NVIDIA Corporation GM200 [GeForce GTX TITAN X] (rev a1)
    Subsystem: eVga.com. Corp. GM200 [GeForce GTX TITAN X]
    Kernel driver in use: nvidia
    Kernel modules: nvidiafb, nouveau, nvidia_drm, nvidia
04:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Lexa XT [Radeon PRO WX 3100]
    Subsystem: Hewlett-Packard Company Lexa XT [Radeon PRO WX 3100]
    Kernel driver in use: amdgpu
    Kernel modules: amdgpu

Below is what I found in /usr/share/X11/xorg.conf.d/10-nvidia.conf.

Section "OutputClass"
    Identifier "nvidia"
    MatchDriver "nvidia-drm"
    Driver "nvidia"
    Option "AllowEmptyInitialConfiguration"
    ModulePath "/usr/lib/x86_64-linux-gnu/nvidia/xorg"
EndSection

And here are the contents of /usr/share/X11/xorg.conf.d/10-amdgpu.conf.

Section "OutputClass"
    Identifier "AMDgpu"
    MatchDriver "amdgpu"
    Driver "amdgpu"
EndSection

There is also the I removed the ModulePath entry from 10-nvidia.conf, added it to 10-amdgpu.conf, and restarted the display manager using sudo systemctl restart display-manager. But that resulted in a blank screen. Of course, using /usr/lib/x86_64-linux-gnu/nvidia/xorg in the 10-amdgpu.conf file is not right. So I reverted the changes to these two conf files and restarted the display-manager.

Output of dpkg -l xserver-* | grep 'nvidia\|amdgpu':

ii  xserver-xorg-video-amdgpu      22.0.0-1ubuntu0.1        amd64        X.Org X server -- AMDGPU display driver
ii  xserver-xorg-video-nvidia-520  520.61.05-0ubuntu1       amd64        NVIDIA binary Xorg driver

Any thoughts?

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