Tracking what prevents the processor from entering deeper PCStates

Software Tuning, Performance Optimization & Platform Monitoring

Discussion regarding monitoring and software tuning methodologies, Performance Monitoring Unit (PMU) of Intel microprocessors, and platform updating.

Tracking what prevents the processor from entering deeper PCStates

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Is there a list or a tool which can determine what prevents the processor from entering deeper package c-states despite core c states being deep enough. I'm troubleshooting my desktop and comparing it with my laptop. My desktop running a 6600k never enters deeper pcstates beyond C2 despite the cores spending 95% of the time in C7

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