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Linux on XPS 13 9370: CPU idle but package never above pc2

Looking at optimizing the battery life, I noticed via powertop that the package level never switches to pc3 or above. From what I learned it means that the GPU is running continuously and that it might actually be harmful to the processor. Smiley Sad

I'm running Fedora 28 and tried some tools, did a BIOS update, checked BIOS settings, but so far could not find any solution.

Any ideas? 

Here a powertop output:Screenshot from 2018-09-17 20-31-46.pngpowertop output



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