C-States not working on Z370 Gaming K6

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   I'm having trouble with the c-states on this board, using a 8700k and the current 1.40 bios release.
No matter how I set up the energy saving options in bios, "auto" or "enabled", the CPU won't enter any of the lower c-states. C3-C7 definitely don't work so far.
I can see clockrate changes, voltage changes, but the parts of the CPU never turn off. 

I tried installing the current Management Engine, didn't help either. Windows 10 is the most current version also.

Any ideas what could cause this? Thanks!

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Radical_53 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 Apr 2017 Status: Offline Points: 34	Post Options Post Reply Quote Radical_53 Report Post Thanks(0) Quote Reply Topic: C-States not working on Z370 Gaming K6 Posted: 11 Feb 2018 at 5:32am
	I'm having trouble with the c-states on this board, using a 8700k and the current 1.40 bios release. No matter how I set up the energy saving options in bios, "auto" or "enabled", the CPU won't enter any of the lower c-states. C3-C7 definitely don't work so far. I can see clockrate changes, voltage changes, but the parts of the CPU never turn off. I tried installing the current Management Engine, didn't help either. Windows 10 is the most current version also. Any ideas what could cause this? Thanks!

Cata79 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 30 Dec 2017 Status: Offline Points: 24	Post Options Post Reply Quote Cata79 Report Post Thanks(0) Quote Reply Posted: 11 Feb 2018 at 4:51pm
	Are you on high performance windows power plan?

Radical_53 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 Apr 2017 Status: Offline Points: 34	Post Options Post Reply Quote Radical_53 Report Post Thanks(0) Quote Reply Posted: 19 Feb 2018 at 3:42am
	No, balanced usually. Even with no load on the CPU, I don't see any lower c-states-

Cata79 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 30 Dec 2017 Status: Offline Points: 24	Post Options Post Reply Quote Cata79 Report Post Thanks(0) Quote Reply Posted: 20 Feb 2018 at 2:09pm
	make sure that in advanced power settings, minimum processor state is not at 100%. Sometimes windows changes this value to 100% because f**k logic.

Radical_53 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 16 Apr 2017 Status: Offline Points: 34	Post Options Post Reply Quote Radical_53 Report Post Thanks(0) Quote Reply Posted: 28 Feb 2018 at 12:13am
	No, that's at 5%. I tried 0% also, but it didn't change anything. Also, the energy report tells me that no selective power saving doesn't work for any of the USB ports. I must admit that they do turn off, but then some of them won't turn on again anymore (I have to re-plug my stuff to get them workingm, quite annoying).