C1E enabled, boot after shut down stuck before BIOS

[matchop]

I wonder if anyone has the same problem.

 

Scenarios:

 

1. C1E (enhance halt, so it says in the BIOS) enabled:

- Windows 7 : boot + shut down + speedstep + boot-after-shutdown = works

- Mac : boot + shutdown + speedstep = works. Boot-after-shutdown = stuck before BIOS. I didnt even see BIOS page, the machine just stuck as if it is busy, but nothing happen (or will ever happen).

 

2. C1E disabled

- Mac works perfectly (even boot after shutdown).

- Windows works fine, except speedstep. The speed stuck at full CPU speed.

 

Any idea?