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1b1ed1a
(Get the code!)
CPU averages:
5.3.0-19: 2.03W, 99.6% idle, 0.1% in kernel, 93.5% in C10 state, 5.3% in C8 state, 1.66GHz
5.3.0-23: 13.71W, 99.3% idle, 0.1% in kernel, 92.3% in C10 state, 6.1% in C8 state, 2.05GHz
GPU averages:
5.3.0-19: 0.10W
5.3.0-23: 7.19W
ACPI thermal zone:
5.3.0-19: 38.92 C
5.3.0.23: 68.65 C
So, not much difference in CPU loading or in C10/C8 states, but it is clocked faster on the -23 kernel and is 11.7W more power being consumed. The GPU is also consuming far more power in the -23 kernel. The ACPI thermal zone is ~30 degrees hotter, hence the fan activity.
Given the kernel changes I provided made no changes, this looks like a i915 regression somehow. I'll see what has changed there.