On 08/16/2018 01:31 PM, Chris Murphy wrote:
kernel 4.17, and there's only light fan or no fan usage when those
processes spin up.

After a little research, it appears that this is related to the intel_powerclamp module which is supposed to protect your processor from overheating. What is the CPU temperature? I know you said the fan is low, but maybe the fan control isn't working properly? Or it might be the GPU temperature. You could try "rmmod intel_powerclamp", but be careful. Make sure you check your temperatures.

More info:
https://www.kernel.org/doc/Documentation/thermal/intel_powerclamp.txt
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