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C state behavior question

HWhelp
Beginner
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C-state behavior changes when the CPU is idle
When set to C7, it will run at C3 

HWhelp_0-1670573621451.png

When set to C6, it will run on C2

HWhelp_1-1670573669446.png

Kindly ask why the CPU cannot go to C3 when the Max CPU C-state(in BIOS) is set to C6 under the same Idle situation? Is it caused by Window Driver, BIOS or other drivers? Thanks

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Alberto_R_Intel
Moderator
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Hello HWhelp, I just wanted to check if the information posted previously was useful for you and if you need further assistance on this matter?


Regards,

Albert R.


Intel Customer Support Technician


View solution in original post

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Alberto_R_Intel
Moderator
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HWhelp, Thank you for posting in the Intel® Communities Support.


In order for us to provide the most accurate assistance on this scenario, we just wanted to confirm a few details about your system:

What is the model of the Intel® process?

What is the model of the motherboard?

If this is a laptop, what is the model of it?

Was it working fine before?

When did the issue start?

Did you make any recent hardware/software changes that might cause this issue?

Which Windows* version are you using?

Does the problem happen at home or in the work environment?

Please attach the SSU report so we can verify further details about the components in your platform, check all the options in the report including the one that says "3rd party software logs":

https://downloadcenter.intel.com/download/25293/Intel-System-Support-Utility-for-Windows-?product=91600


Any questions, please let me know.


Regards,

Albert R.


Intel Customer Support Technician


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HWhelp
Beginner
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Greetings Albert R.,

Please refer to the attachment for the information.

Was it working fine before?

I don't know if this C state behavior works normal as the description above.

When did the issue start?

The issue happened when we modify the <Max CPU C-state> (in BIOS).

Did you make any recent hardware/software changes that might cause this issue?

No recent hardware/software changes.

 

 

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Alberto_R_Intel
Moderator
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Hello HWhelp, Thank you very much for providing that information and the SSU report.

 

Accroding to the SSU report, the processor model on your device is Intel® Celeron® Processor N2807.

 

In order to rule out a possible hardware problem with the Intel® processor, please install and run the Intel® Processor Disganotc Tool, it does an overall test on the unit and if it passes the test it means it is working properly:

https://www.intel.com/content/www/us/en/download/15951/intel-processor-diagnostic-tool.html?wapkw=intel%20processor%20diagnostic%20tool

 

Also, we can notice on the SSU document, that the Windows* version on your computer is: "Microsoft Windows 10 Enterprise LTSC". Even though the processor is fully compatible with Windows* 10, the "LTSC" version being used will create limitations since that version only installs security updates which in a overall performance could create the problem with the C-states that you are describing:

https://www.intel.com/content/www/us/en/support/articles/000006105/processors.html

 

It is essential to mention, that when using a mobile device, such as a laptop, everything is customized by the manufacturer of it, in this case, DFI Inc. They can enable/disable BIOS features as well as features and functions of the machine to comply with the functionality they advertised for their products. They also provide all the technical support to their BIOS and its settings which is particularly important in this scenario based on the fact that the problem started after the "Max CPU C-state" was modified in BIOS. 

 

So, what we recommend will be to get in contact directly with DFI Inc support in order to confirm if the latest BIOS version is currently installed on your system or to gather the instructions on how to update it and also, to verify with them if they have further suggestions on this matter:

https://www.dfi.com/contact/support

 

Since the problem also could be related to Windows* itself, we also advise to get in contact directly with Microsoft Support, so they can confirm if the problem could be related due to the fact that the "LTSC" version is being used and for additional recommendations on this topic:

https://support.microsoft.com/en-us

 

In the links below you will find additional details about C-States provided by Microsoft:

https://learn.microsoft.com/en-us/previous-versions/windows/desktop/xperf/cpu-idle-states

https://learn.microsoft.com/en-us/previous-versions/windows/desktop/xperf/to-see-how-much-time-the-cpu-spent-at-each-c-state

 

Once you get the chance, please let us know the results.

 

Regards,

Albert R.

 

Intel Customer Support Technician

 

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Alberto_R_Intel
Moderator
578 Views

Hello HWhelp, I just wanted to check if the information posted previously was useful for you and if you need further assistance on this matter?


Regards,

Albert R.


Intel Customer Support Technician


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Alberto_R_Intel
Moderator
562 Views

Hello HWhelp, Since we have not heard back from you, we are closing the case, but if you have any additional questions, please post them on a new thread so we can further assist you with this matter.


Regards,

Albert R.


Intel Customer Support Technician


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