Suboptimal power management at idle

NVIDIA Open GPU Kernel Modules Version

515.57

Does this happen with the proprietary driver (of the same version) as well?

No

Operating System and Version

Gentoo

Kernel Release

5.18.8 (custom)

Hardware: GPU

NVIDIA GeForce RTX 3080

Describe the bug

Open driver has higher idle power usage than proprietary one. 44W vs 22W

nvidia-smi with proprietary driver reports:
Clocks
Graphics : 0 MHz
SM : 0 MHz
Memory : 405 MHz
Video : 555 MHz
Voltage
Graphics : 0.000 mV

nvidia-smi with open driver reports:
Clocks
Graphics : 210 MHz
SM : 210 MHz
Memory : 405 MHz
Video : 555 MHz
Voltage
Graphics : 750.000 mV

To Reproduce

I just have to switch from proprietary to open driver and run nvidia-smi to see the difference.

Bug Incidence

Always

nvidia-bug-report.log.gz

Can't share without sanitization and there is a lot to review.

More Info

I am using this card only for compute. It has connected display, but it isn't being used (excluded from Xorg, nvidia-smi reports Display Mode/Active as disabled), display is being driven by other card. Driver persistence is enabled.

Start by reproducing the comparison with nvidia-smi on the open and proprietary drivers using the reported RTX 3080, Gentoo system, and custom 5.18.8 kernel. Compare idle graphics and SM clocks, voltage, and power usage; done means identifying why the open driver remains at 210 MHz and 750 mV or documenting a matching fix.