diff --git a/docs/intel-me.md b/docs/intel-me.md index eacab935..7960a277 100644 --- a/docs/intel-me.md +++ b/docs/intel-me.md @@ -55,15 +55,18 @@ ME: Current Operation Mode : 0 ME: Error Code : 0 ``` -## Tiger Lake-U - -Models using TGL-U processors default to having the IME enabled. TGL-U removes -support for S3 and requires S0ix. This requires all CPU, PCH, and PCIe devices -to have ACPI defined low power states. With S0ix, the CPU has numerous states -for low power, with the lowest being C10. In order to reach this C10 state, the -IME must report that it is in a low power state. Disabling the ME with the HAP -bit keeps the CPU in the C8 state. This nearly triples the power usage in S0ix -suspend, from around 1 watt to around 3 watts. +## S0ix + +S0ix (Modern Standby, s2idle) requires all CPU, PCH, and PCIe devices to have +ACPI defined low power states. The CPU has numerous states for low power, with +the lowest being C10. In order to reach this C10 state, the CSME must report +that it is in a low power state. + +Disabling the CSME with the HAP bit or HECI command keeps the CPU in the C8 +state. This nearly triples the power usage in S0ix suspend, from around 1 watt +to around 3 watts. + +TGL-U removed support for S3 and requires S0ix. [wiki]: https://en.wikipedia.org/wiki/Intel_Management_Engine