[FAQ] Seeking explanation for /proc/driver/nvidia/gpus/0000:09:00.0/power

In this file I have this:

Runtime D3 status:          Disabled by default
Video Memory:               Active

GPU Hardware Support:
 Video Memory Self Refresh: Not Supported
 Video Memory Off:          Supported

S0ix Power Management:
 Platform Support:          Not Supported
 Status:                    Disabled

It would be great to learn what these things are, and what are the possible reasons/explanations for them to be “Not supported”.

My GPU is 4070S on an AMD X570 based motherboard.

This is partially explained here: Chapter 21. Configuring Power Management Support

@aplattner @abchauhan