Just to let you know, my Intel Core i5 6360U on Windows 10 (1709) situation: Package C State Percent was not using C6 enough (around 10% from time to time) as soon as I enabled WiFi (Airplane Mode OFF) and was staying mainly in C3 (around 80%). I found that enabling Windows Power Options -> Advanced Settings -> Wireless Adapter Settings -> Power Saving Mode -> Plugged in: "Maximum Power savings" had a positive effect on C6 % (basically, it's using C6 now instead of C3).
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Just to let you know, my Intel Core i5 6360U on Windows 10 (1709) situation:
Package C State Percent was not using C6 enough (around 10% from time to time) as soon as I enabled WiFi (Airplane Mode OFF) and was staying mainly in C3 (around 80%).
I found that enabling Windows Power Options -> Advanced Settings -> Wireless Adapter Settings -> Power Saving Mode -> Plugged in: "Maximum Power savings" had a positive effect on C6 % (basically, it's using C6 now instead of C3).
Have a great week end !