Which BIOS settings are necessary for the OS to control CPU scaling on Dell Systems

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Some Dell systems by default have the CPU Power Management Profile set to DPAC (Dell Active Power Control). The DPAC mode allows the BIOS to
manage the processor power states. In order for the OS to manage the processor power states the BIOS CPU Power Management Profile needs to be set to OS DBPM mode (Demand Based Power Management). OS DBPM is the recommended BIOS settings for all Dell systems when using Red Hat Enterprise Linux. If CPU Scaling is not working on your Dell system please verify the BIOS settings are as recommended. Please refer to Dell published BIOS Setup User Guides for your specific system to determine the how to configure the recommended settings.

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