https://bugzilla.kernel.org/show_bug.cgi?id=51381
--- Comment #50 from Alex Deucher alexdeucher@gmail.com --- Your system does not appear to support powerdown of the dGPU. From your log: [ 9.611183] ATPX version 1, functions 0x00000181 Bit 1 of the functions should be set if it does.