>High (and loud) fan speeds.
I stumbled across this after reading what seemed like half the internet (but obviously the wrong half )
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n5010 molly2 # echo profile > /sys/class/drm/card0/device/power_method
n5010 molly2 # echo low > /sys/class/drm/card0/device/power_profile
It should be noted that the "low" setting may not work on all laptops. The "dynpm" setting caused my display to flicker occasionally.
Temperatures reduced by +10 deg Celsius immediately, fan, still on, but quieter.
I recommend making a note of the original settings before changing (just cat the above files).
Not a perfect solution, but a lot better.