computer won't shut down if CPU minimum state is not 100%

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rancor_jackhammer

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Dec 16, 2015
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Hi, I have Windows 10 system (not an upgrade, installed from DVD on a new PC).

My CPU is i5 6600, motherboard msi b150m pro-vh, PSU Thermaltake Smart SE 530W, GPU MSI GTX 970

My new PC ran properly for 1.5 months and then for the first time a problem with shutdown occured. Windows is logging off normally, the screen goes black, but fans, GPU, and all LEDs are working, power is still ON. To completeky shutdown, I had to manually press power for 5s.

I resolved this issue by changing my power plan from balanced to high performance.

Still I was curious what is the cause of my problem. I compared both power plans and figured out that it was minimum CPU state setting. If it is not set to 100% (just as in high performance power plan), my PC won't turn the power off. In balanced, it is at 5%. Additionally, I tried to set it to 75% and got continuous beep after Windows was closed (still I had to switch it off manually).

Right now I am after Windows 10 refresh and the problem still occurs.

Do you have any idea what can be the cause of this issue?
 
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Karsten75

Karsten75

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Oct 15, 2009
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So you're asking about hardware and power, but yo omit to provide details about your motherboard and PSU? If you had asked in the Windows 10 forums, you could be forgiven for that. Here it is a grave omission of material facts.

Also, if you do provide those details, can you recall the beep sequence? Long/short beeps, number and intervals between them? Beep codes are a tyupe of Morse code to indicate motherboard errors.
 
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rancor_jackhammer

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Dec 16, 2015
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I'm sorry for omission of these facts. Opening post is updated now with all necessary information I hope.

Unfortunately, I don't remember any sequence. It was a constant beep for a few seconds before I switched it off manually as described. I may try to repeat this, if it's not something dangerous to hardware.


 
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Karsten75

Karsten75

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No problem. :)

I'm suspecting your PSU. Its a good one, but getting a bit on it I'm not mistaken. Some older PSUs don't support the more recent Intel low-power states (C5/C6) and those have to be disabled in the BIOS if the PSU doesn't support them.

Even so, there are a few suspicious things about the PSU, such as that it's rated at 35C, whereas most good models are rated at 50C.

Is this a new PSU?

If disabling low-power states in BIOS doesn't help, then you may have to confirm the beep codes.

Also look in Event viewer if Windows logged any events around the time of your attempted shutdown.
 
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rancor_jackhammer

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Dec 16, 2015
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Yes, that is an almost new PSU - 3 months old.

I tried changing CPU C states in BIOS (limit was set to auto). I set CPU minimum state (in OS) to 5% and started to check states one after another. Strangely, none of them was followed by problem described by my, although I noticed that the time needed for PC to power off varied. I set the limit in BIOS to auto again and the problem did not happen again since that moment.

I only had a problem with getting back from hibernate state today (I still have auto setting in BIOS for C limits and 5% as CPU minimum state). It was logged in event logger as Kernel-Boot error with code 0xC00000D4.

I will try to change CPU C states and see if there is any mark in event logger.

 
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