Asus Z77-A - Manual (Page 68)

Chapter 2: BIOS information 2-22
CPU C3 Report [Auto]
Allows you to disable or enable the CPU C3 report to OS.
[Auto] Set this item automatically.
[Enabled] Enables the C3 report function. This item should be enabled in
order to enable the Enhanced Halt State.
[Disabled] Disables this function.
CPU C6 Report [Auto]
Allows you to disable or enable the CPU C6 report to OS.
[Auto] Set this item automatically.
[Enabled] Enables the C6 report function. This item should be enabled in
order to enable the Enhanced Halt State.
[Disabled] Disables this function.
Package C State Support [Auto]
Allows you to enable or disable the CPU C State support.
[Auto] Set this item automatically.
[Enabled] Enables C State Support.
[Disabled] Disables C State Support