Ich habe folgende Info gefunden:
"OS-Controlled
In OS-controlled state CpuIdle's cooling loop will be disabled. Instead the OS will try to perform the cooling, if available. The benefit of using this mode with CpuIdle is that CpuIdle's chipset and CPU optimizations are still applied, but no additional thread is created.
S1 and C2
S1 and C2 modes are described in detail in the ACPI specification. While S1 mode is available on all systems (HLT is exectuted), C2 mode is only available on certain chipsets. CpuIdle will try to detect and enable C2 idling on the chipset. If not available, an error message will be displayed when selecting C2 mode.
If C2 mode is supported, more power savings can be gained than in S1 mode, possibly at the cost of slight performance degradation, as it would take the CPU/ PCI subsystem longer to wake up."
Gruß,
Frittenbude