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:
- $sudo vim /usr/share/X11/xorg.conf.d/20-gpu.conf
- Edit
- Section "ServerLayout"
- Identifier "layout"
- Screen 0 "nvidia_1"
- EndSection
- Section "Device"
- Identifier "nvidia_0"
- Driver "nvidia"
- BusID "PCI:65:0:0"
- Option "Ignore" "true"
- EndSection
- Section "Device"
- Identifier "nvidia_1"
- Driver "nvidia"
- BusID "PCI:129:0:0"
- EndSection
- Section "Screen"
- Identifier "nvidia_1"
- Device "nvidia_1"
- 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:
cat /var/log/Xorg.0.log | grep NVIDIA
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