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NVIDIA GPU sticks to P0 unless explicitly used once (server, headless)

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  • NVIDIA GPU sticks to P0 unless explicitly used once (server, headless)

    Hey,

    I've recently switched from a GT710 to a GTX1660 on my Ubuntu Server (22.04.1 LTS) to enable turing hw acceleration in Plex Media Server.

    After playing with multiple driver versions I've noticed a bug that's 100% reproducible (tested with nvidia-driver-470, nvidia-driver-515-server and nvidia-driver-515):
    Unless the GPU is at least used once after a reboot, its power state stays at P0 (~20-22W) and does not drop.

    Un-stickying this power state can be achieved by (obviously) utilizing the GPU in Plex, running nvtop, or adding a poor-man's approach to the startup sequence (in my case rc.local), such as:
    Code:
    ffmpeg -y -vsync 0 -hwaccel cuda -hwaccel_output_format cuda -f lavfi -i testsrc=duration=1 -t 50 -vf hwupload -c:a copy -c:v h264_nvenc -b:v 4M -f null -
    This then results in the proper GPU state (P8 in this case):

    Code:
    +-----------------------------------------------------------------------------+
    | NVIDIA-SMI 515.65.01 Driver Version: 515.65.01 CUDA Version: 11.7 |
    |-------------------------------+----------------------+----------------------+
    | 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 NVIDIA GeForce ... Off | 00000000:09:00.0 On | N/A |
    | 0% 45C P8 10W / 130W | 3MiB / 6144MiB | 0% Default |
    | | | N/A |
    +-------------------------------+----------------------+----------------------+
    
    +-----------------------------------------------------------------------------+
    | Processes: |
    | GPU GI CI PID Type Process name GPU Memory |
    | ID ID Usage |
    |================================================= ============================|
    | No running processes found |
    +-----------------------------------------------------------------------------+
    ‚Äč
    Maybe this helps users who wonder about their power utilization after a reboot, who rarely use their GPU.


    Best regards,

    panni
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