Energy management turbo boost stopped doing his work Lenovo Y5070

Hello

I restarted my laptop and the processor is stuck at 2.5 GHz, in all modes of energy.
The Turbo no longer works and even when I choose low energy or download mode, the frequency is 2.5 GHz while he was 0.75 GHz before.
No idea how to solve this problem?

I solved the problem, it turns out that activtion of Hyper-V is the original CPU clock displays task manager. But in reality, the management must turbo boost and energy that I saw in action with CPU - Z

Tags: Lenovo Notebooks

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