Tenho uma nova instalação do Ubuntu 12.04.4 LTS e CUDA 5.5 com driver nvidia-331.20. Existem 4 GeForce GTX 780 na placa. X roda na placa integrada, enquanto as placas da Nvidia são sobrepostas para fazer alguns cálculos.
Tenho notado que a rotação do ventilador da 3ª placa é 0 quando nenhum cálculo é realizado apesar da temperatura:
Quando alguns cálculos:
+------------------------------------------------------+
| NVIDIA-SMI 331.20 Driver Version: 331.20 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 780 Off | 0000:02:00.0 N/A | N/A |
| 46% 80C N/A N/A / N/A | 93MiB / 3071MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
| 1 GeForce GTX 780 Off | 0000:03:00.0 N/A | N/A |
| 47% 80C N/A N/A / N/A | 93MiB / 3071MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
| 2 GeForce GTX 780 Off | 0000:83:00.0 N/A | N/A |
| 43% 79C N/A N/A / N/A | 93MiB / 3071MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
| 3 GeForce GTX 780 Off | 0000:84:00.0 N/A | N/A |
| 48% 80C N/A N/A / N/A | 93MiB / 3071MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
Logo após o término dos cálculos:
+------------------------------------------------------+
| NVIDIA-SMI 331.20 Driver Version: 331.20 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 780 Off | 0000:02:00.0 N/A | N/A |
| 38% 73C N/A N/A / N/A | 10MiB / 3071MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
| 1 GeForce GTX 780 Off | 0000:03:00.0 N/A | N/A |
| 38% 73C N/A N/A / N/A | 10MiB / 3071MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
| 2 GeForce GTX 780 Off | 0000:83:00.0 N/A | N/A |
| 38% 73C N/A N/A / N/A | 10MiB / 3071MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
| 3 GeForce GTX 780 Off | 0000:84:00.0 N/A | N/A |
| 0% 75C N/A N/A / N/A | 10MiB / 3071MiB | N/A Default |
+-------------------------------+----------------------+----------------------+
O que poderia fazer com que um fã de cartas agisse assim?