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I have the same problem exactly, it seems:
1. Dell Latitude E7440
2. Updated bios to the latest and - I think - then problems started
3. Tried to downgrade back to the previous bios, but it was of no help
4. specs: Windows 10 64, Dell E7440 with I5-4300U, 8GB Ram, 256GB SSD.
Error: CPU stack at 0.8GHZ, no matter what power plan I'm using
It changes for a few seconds if I pull the power plug out, put the laptop to sleep, waking it up and connect to it to the AC again. It lasts for few seconds though
Before I had this problem, I had a different problem - whenever the laptop was running, if I plugged it to the AC, it would halt. I would have to put it to sleep and waking it up and then it was ok again.