Ubuntu recognize only 1 gpu

Hi,

I have a RTX 3070 and a GTX 1050 installed in my system, but Ubuntu recognizes only the 3070. Here the output of nvidia-smi:

±----------------------------------------------------------------------------+
| NVIDIA-SMI 455.38 Driver Version: 455.38 CUDA Version: 11.1 |
|-------------------------------±---------------------±---------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 GeForce RTX 3070 Off | 00000000:07:00.0 On | N/A |
| 0% 41C P8 17W / 220W | 416MiB / 7948MiB | 2% Default |
| | | N/A |
±------------------------------±---------------------±---------------------+

±----------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| 0 N/A N/A 1542 G /usr/lib/xorg/Xorg 245MiB |
| 0 N/A N/A 1674 G /usr/bin/gnome-shell 164MiB |
| 0 N/A N/A 2183 G /usr/lib/firefox/firefox 3MiB |
±----------------------------------------------------------------------------+

Thanks