https://bugs.freedesktop.org/show_bug.cgi?id=102468
--- Comment #1 from Alex Deucher alexdeucher@gmail.com --- (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?