RTX6000 Blackwell Server no X display under Ubuntu 24.04 .03 LTS

spock67 · November 10, 2025, 1:32am

Hi everyone. I have a GPU system pre-installed with eight RTX 6000 Server edition cards. Ubuntu 24.04.03 LTS and CUDA 13.0 Update 2 are pre-installed.

Right now the X display is only active for the onboard Aspeed 2600 VGA. All eight GPU are detected when running nvidia-smi.

±----------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=========================================================================================|
| 0 N/A N/A 3399 G /usr/lib/xorg/Xorg 4MiB |
| 1 N/A N/A 3399 G /usr/lib/xorg/Xorg 4MiB |
| 2 N/A N/A 3399 G /usr/lib/xorg/Xorg 4MiB |
| 3 N/A N/A 3399 G /usr/lib/xorg/Xorg 4MiB |
| 4 N/A N/A 3399 G /usr/lib/xorg/Xorg 4MiB |
| 5 N/A N/A 3399 G /usr/lib/xorg/Xorg 4MiB |
| 6 N/A N/A 3399 G /usr/lib/xorg/Xorg 4MiB |
| 7 N/A N/A 3399 G /usr/lib/xorg/Xorg 4MiB |
±----------------------------------------------------------------------------------------+

The NVIDA kernel modules are loaded.

nvidia_uvm 2158592 0
nvidia_drm 139264 25
nvidia_modeset 1814528 2 nvidia_drm
nvidia 14376960 296 nvidia_uvm,nvidia_modeset
video 77824 1 nvidia_modeset
ecc 45056 1 nvidia

However, I notice these warning messages in the system log file.

[ 8.670773] nvidia: loading out-of-tree module taints kernel.
[ 8.670782] nvidia: module verification failed: signature and/or required key missing - tainting kernel
[ 8.732945] nvidia-nvlink: Nvlink Core is being initialized, major device number 511
[ 8.735718] nvidia 0000:75:00.0: enabling device (0000 → 0002)
[ 8.750814] nvidia 0000:76:00.0: enabling device (0000 → 0002)
[ 8.762827] nvidia 0000:06:00.0: enabling device (0000 → 0002)
[ 8.775820] nvidia 0000:07:00.0: enabling device (0000 → 0002)
[ 8.827062] nvidia 0000:f4:00.0: enabling device (0000 → 0002)
[ 8.840839] nvidia 0000:f5:00.0: enabling device (0000 → 0002)
[ 8.855826] nvidia 0000:84:00.0: enabling device (0000 → 0002)
[ 8.866827] nvidia 0000:85:00.0: enabling device (0000 → 0002)
[ 8.903948] nvidia-modeset: Loading NVIDIA UNIX Open Kernel Mode Setting Driver for x86_64 580.95.05 Release Build (dvs-builder@U22-I3-B17-02-5) Tue Sep 23 09:42:01 UTC 2025
[ 8.905953] [drm] [nvidia-drm] [GPU ID 0x00007500] Loading driver
[ 10.320038] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:75:00.0 on minor 1
[ 10.320065] nvidia 0000:75:00.0: [drm] No compatible format found
[ 10.320068] nvidia 0000:75:00.0: [drm] Cannot find any crtc or sizes
[ 10.320096] [drm] [nvidia-drm] [GPU ID 0x00007600] Loading driver
[ 11.607486] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:76:00.0 on minor 2
[ 11.607508] nvidia 0000:76:00.0: [drm] No compatible format found
[ 11.607511] nvidia 0000:76:00.0: [drm] Cannot find any crtc or sizes
[ 11.607539] [drm] [nvidia-drm] [GPU ID 0x00000600] Loading driver
[ 12.875815] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:06:00.0 on minor 3
[ 12.875842] nvidia 0000:06:00.0: [drm] No compatible format found
[ 12.875844] nvidia 0000:06:00.0: [drm] Cannot find any crtc or sizes
[ 12.875871] [drm] [nvidia-drm] [GPU ID 0x00000700] Loading driver
[ 14.146522] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:07:00.0 on minor 4
[ 14.146540] nvidia 0000:07:00.0: [drm] No compatible format found
[ 14.146544] nvidia 0000:07:00.0: [drm] Cannot find any crtc or sizes
[ 14.146584] [drm] [nvidia-drm] [GPU ID 0x0000f400] Loading driver
[ 15.421731] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:f4:00.0 on minor 5
[ 15.421748] nvidia 0000:f4:00.0: [drm] No compatible format found
[ 15.421751] nvidia 0000:f4:00.0: [drm] Cannot find any crtc or sizes
[ 15.421795] [drm] [nvidia-drm] [GPU ID 0x0000f500] Loading driver
[ 16.701099] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:f5:00.0 on minor 6
[ 16.701121] nvidia 0000:f5:00.0: [drm] No compatible format found
[ 16.701124] nvidia 0000:f5:00.0: [drm] Cannot find any crtc or sizes
[ 16.701163] [drm] [nvidia-drm] [GPU ID 0x00008400] Loading driver
[ 17.973979] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:84:00.0 on minor 7
[ 17.973999] nvidia 0000:84:00.0: [drm] No compatible format found
[ 17.974002] nvidia 0000:84:00.0: [drm] Cannot find any crtc or sizes
[ 17.974047] [drm] [nvidia-drm] [GPU ID 0x00008500] Loading driver
[ 19.243960] [drm] Initialized nvidia-drm 0.0.0 20160202 for 0000:85:00.0 on minor 8
[ 19.243981] nvidia 0000:85:00.0: [drm] No compatible format found
[ 19.243984] nvidia 0000:85:00.0: [drm] Cannot find any crtc or sizes

The crtc or sizes might be relating to the monitor? I just have one monitor connected to the 1st GPU via the DisplayPort.

If you have any idea why the X Server does not launch on the 1st Quadro RTX 6000 GPU, please let me know.

Thank you in advance for the helps!

Panchovix · November 10, 2025, 2:23am

I think server ones are at default compute mode? So you would have to change it to display mode with --gpumode tool.

Correct me if I’m wrong though,

spock67 · November 10, 2025, 4:14am

Thank you so much. You are absolutely correct here. No wonder there is no X output.