Comment # 1 on bug 102468 from Alex Deucher

(In reply to taijian from comment #0)
> If I blacklist amdgpu in the kcl and then force the dGPU to off with
> acpi_call, the reported power consumption in powertop drops to ~12 W, with a
> corresponding increase in battery time. The CPU is now able to reach pc3.

What acpi call did you use?