Nvidia DGX Spark encrypted firmware cuts Linux inference speed

On Linux, Nvidia's DGX Spark laptop locks the GPU to about 780 MHz versus 2.2 GHz on Windows, because its encrypted power firmware is only readable by the Windows driver. GPT-OSS-120B inference drops from 65.4 to 13.9 tokens/s. WSL keeps full performance; a real fix needs Nvidia.

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