This is a Thinkpad T400-2767R28 box.
The main problems are:
1. C-State cannot be stablely enabled.
2. The lid display cannot sleep while the display sleep time.
3. The system cannot sleep at all, when I try to put the system to sleep, I just got freezed system.
I think that I am very near to the right place , but I just cannot find the way.
Thank you in advance!