Resolving GPU Allocation Issues for Xorg in Multi-GPU Systems

Environment

RAID Model: SR1000 or SR1010 etc

Host Hardware: AMD/Intel/Supermicro model etc

Operating System: Linux

Issue

Xorg is defaulting to SupremeRAID card instead of user's GPU for display output.
Example:

Users may find that the Xorg server prioritizes the A2000 GPU for display instead of the desired A5000 GPU.

Resolution

1. Environment Preparation:
 - Verify system resources using tools like nvidia-smi.

2.Update Xorg Configuration:

 -Create or edit the file:

1.    $sudo vim /usr/share/X11/xorg.conf.d/20-gpu.conf

- Edit 

2. Section "ServerLayout"
3.     Identifier "layout"
4.     Screen 0 "nvidia_1"
5. EndSection
6. 
   
7. Section "Device"
8.     Identifier "nvidia_0"
9.     Driver "nvidia"
10.     BusID "PCI:65:0:0"  
11.     Option "Ignore" "true"
12. EndSection
13. 
    
14. Section "Device"
15.     Identifier "nvidia_1"
16.     Driver "nvidia"
17.     BusID "PCI:129:0:0"  
18. EndSection
19. 
    
20. Section "Screen"
21.     Identifier "nvidia_1"
22.     Device "nvidia_1"
23. EndSection

# The BusID correctly identifies the A2000 using the format PCI:<Domain>:<Bus>:<Device>. In this example, A2000's BusID is PCI:65:0:0, which matches the example value of 00000000:41:00.0.

3. Verify Configuration

• Use nvidia-smi to check if  Xorg is using primary display.
• Check logs if further debugging is  required:
  1. cat /var/log/Xorg.0.log | grep NVIDIA

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