X.org Configured for NVIDIA (2x GPU) Compute Only (Virtual Display) for Unraid

xorg.conf

# The purpose of this configuration is to use NVIDIA GPU(s) for compute applications (NOT for actual display in Xorg).
#
# The use case for this configuration is enabling an Unraid system to fully function with basic hardware acceleration while
# retaining FULL processing power from discrete GPU(s) for mining, video encoding, etc. In order to enable FULL processing
# power of NVIDIA, nvidia-settings must be used to make overclocking adjustments.
#
# This has been tested with two MSI VENTUS GeForce RTX™ 3060 2X 12G OC LHR
# (https://www.techpowerup.com/gpu-specs/msi-rtx-3060-ventus-2x-oc-lhr.b9132)
#
# Useful resources
# ----------------
# http://litaotju.github.io/2019/03/13/=Use-intel-for-display-nvidia-for-computing/
# https://gist.github.com/wangruohui/bc7b9f424e3d5deb0c0b8bba990b1bc5
#
# This is hand modified mixture of the output from the following commands:
# - nvidia-xconfig --cool-bits=31 --allow-empty-initial-configuration --virtual=1920x1080 --enable-all-gpus --separate-x-screens -o /tmp/xorg.conf
# - Xorg :0 -configure
#
# In order to use nvidia-settings, the NVIDIA GPU(s) use a small amount of GPU memory to create unused virtual display(s):
# +-----------------------------------------------------------------------------+
# | Processes:                                                                  |
# |  GPU   GI   CI        PID   Type   Process name                  GPU Memory |
# |        ID   ID                                                   Usage      |
# |=============================================================================|
# |    0   N/A  N/A     30729      G   /usr/libexec/Xorg                   4MiB |
# |    1   N/A  N/A     30729      G   /usr/libexec/Xorg                   4MiB |
# +-----------------------------------------------------------------------------+
#
# Identifier Naming
# -----------------
# NVIDIA 1:
#   Device:  "Device0"
#   Screen:  "Screen0"
#   Monitor: "Monitor0"
# NVIDIA 2:
#   Device:  "Device1"
#   Screen:  "Screen1"
#   Monitor: "Monitor1"

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/input/mice"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Unknown"
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BusID          "PCI:1:0:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BusID          "PCI:2:0:0"
    Screen          0
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    8
    Option         "AllowEmptyInitialConfiguration" "True"
    Option         "UseDisplayDevice" "None"
    Option         "Coolbits" "31"
    SubSection     "Display"
        Virtual     304 200
        Depth       8
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    8
    Option         "AllowEmptyInitialConfiguration" "True"
    Option         "UseDisplayDevice" "None"
    Option         "Coolbits" "31"
    SubSection     "Display"
        Virtual     304 200
        Depth       8
    EndSubSection
EndSection

Thank you I think! I'm running a PhoenixMiner container via Docker on my Unraid server and have been looking into a means of accessing Coolbits, nvidia-settings and some nvidia-smi commands that require X. It's been a while since I've worked with a Linux OS but I'm assuming I could benefit from this X.org in getting these running!

@DasBeben No worries. This is only part of the solution. I am currently running a T-Rex docker container and I use customized xorg.conf like this in combination with an unraid user script that gets run on first array start: https://gist.github.com/gabrielsond/eea673568c17ff9a4b904cd0eb22760e

@gabrielsond ohmygosh you are amazing, a thousand thanks! You have put great effort into accomplishing exactly what I haven't been able to figure out myself. Great code and comments everywhere - keep up the great work here my friend!