Compressは環境依存が強そうなので分離
add power management support
- experimental stuff.
- auto suspend request.
- placebo???
Capabilities: [78] Power Management version 3
	Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
	Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-