Hi, I have run powertop with root permission with both AC and batter powers. The reported C_States are the same and strange: mahmood@magma:~$ sudo powertop PowerTOP 1.11 (C) 2007, 2008 Intel Corporation Collecting data for 5 seconds Your CPU supports the following C-states : C1 C2 C3 C4 C5 C6 Your BIOS reports the following C-states : C1 C2 C6 Where are C4 and C5? -------------------------- *Mahmood Naderan* -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html