A40 and displayport output

Gaming and Visualization Technologies General Topics and Other SDKs GPU - Hardware
1

Hi,
We have a Dell R750 with two Nvidia A40 graphics cards but none of them seem to be able to output an image to any of the attached DisplayPort monitors.
We have run displaymodeselector.exe --gpumode graphics --auto and selected WDDM using nvidia-smi. Still no output. Any suggestions?

As an aside, does it need an EDID file to detect a monitor or will it automatically detect any attached devices?

Thanks

±--------------------------------------------------------------------------------------+
| NVIDIA-SMI 538.15 Driver Version: 538.15 CUDA Version: 12.2 |
|-----------------------------------------±---------------------±---------------------+
| GPU Name TCC/WDDM | Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap | Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|=========================================+======================+======================|
| 0 NVIDIA A40 WDDM | 00000000:17:00.0 Off | Off |
| 0% 29C P8 20W / 300W | 168MiB / 49140MiB | 5% Default |
| | | N/A |
±----------------------------------------±---------------------±---------------------+
| 1 NVIDIA A40 TCC | 00000000:CA:00.0 Off | Off |
| 0% 30C P8 12W / 300W | 0MiB / 49140MiB | 0% Default |
| | | N/A |
±----------------------------------------±---------------------±---------------------+

±--------------------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=======================================================================================|
| 0 N/A N/A 4864 C+G …5n1h2txyewy\ShellExperienceHost.exe N/A |
| 0 N/A N/A 12960 C+G …Cortana_cw5n1h2txyewy\SearchUI.exe N/A |
| 0 N/A N/A 13112 C+G C:\Windows\explorer.exe N/A |
±--------------------------------------------------------------------------------------+

2

Old post, no reply. We have the same problem though. No DP output from the card even after changing from compute mode to graphics mode. So far my searches have found no answers.

3

IIRC A40 can’t be used as a BOOT GPU, due to the secure boot chip. so, besides changing to DisplayMode=ON, and toggling from default TCC mode to WDDM mode, it also needs another GPU to boot the machine.
If you manage to (remote) access the machine, can you provide the output of a “nvidia-smi -q” ?
Any connected (DP) screen should just work (if calbe and screen work on any different GPU), but your nvidia-smi log shows ONE A40 in WDDM mode, but one still in TCC, any chance you only tried screens on one of the GPUs - the TCC mode one?

4

thanks