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
