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The original was posted on /r/nixos by /u/manbat_xd on 2025-07-21 10:49:11+00:00.

Hello. I have a Dell Precision 7540 with an intel iGPU and an Nvidia T2000 dGPU.

I have set up nvidia prime optimus, as per the wiki: https://nixos.wiki/wiki/Nvidia#Configuring_Optimus_PRIME:_Bus_ID_Values_.28Mandatory.29

But my idle power draw in nixos is still 10 watts.

I have 3 NVMe drives installed, so I can quickly switch OS.

Windows idles at 3.5 watt

Linux mint idles at 4.5 watt

All setup have the same undervolt running. (core/cache -110, iGPU/IO -30, uncore -80)

I would like ask if you have been able to get the idle power draw down and if you might share your nvidia/intel GPU configs.