To show how to lock the CPU frequency to the main frequency.
On FWA-6520, even power saving mode has been disabled in BIOS configuration(EIST, CPU P-state, C-state) and linux boot grub(intel_idle.max_cstate=0 intel_pstate=disable), the CPU frequency still can't be locked to its main frequency.
If this happened, please add "idle=poll" to boot grub.
The effective grub setting related to power saving maybe as the following
intel_idle.max_cstate=0 idle=poll intel_pstate=disable
For more details, please refer to the following links
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