nvidia-smi - GPU shown as "not supported"

Hello!

I have two nvidia cards in my system, the GTX 750 Ti is supported, the GTX 770 is shown as “not supported”.

+-----------------------------------------------------------------------------+
| NVIDIA-SMI 384.81                 Driver Version: 384.81                    |
|-------------------------------+----------------------+----------------------+
| 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 770     Off  | 00000000:01:00.0 N/A |                  N/A |
| 48%   66C    P0    N/A /  N/A |   1922MiB /  1996MiB |     N/A      Default |
+-------------------------------+----------------------+----------------------+
|   1  GeForce GTX 750 Ti  Off  | 00000000:02:00.0 Off |                  N/A |
| 34%   47C    P0    23W /  38W |   1010MiB /  2000MiB |     97%      Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0                    Not Supported                                       |
|    1       931      G   /usr/lib/xorg/Xorg                             5MiB |
|    1      1568      C   ./xmr-stak                                   992MiB |
+-----------------------------------------------------------------------------+

What am I doing wrong?