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DELL E7440, CPU stays at low power stage after waking it up

My issue is the following:

If I close the lid of my pc, than I wake it up, the CPU stack on 0,58GHz (low power state), and to make it function well, I have to restart the PC. It is so embarrassing, for a flagship model. I installed the latest BIOS A15, and I tried it on windows 8.1, and 10 as well. Same problem. Please write a correct BIOS, or advise something.


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