I've been trying to find people with similar issues as me, and no luck. I just installed Ubuntu 18.04 on my newly bought Microsoft Surface Book 2 - and it's a very handy and portable machine. I know it's not "intended" to use linux on such devices, but I am a linux fan so why not.
As of a fresh install, I could notice my computer got really hot - and it stayed hot. It turns one of my CPU threads are maxed out all the time. Why is ubuntu doing this? I can't find any processes using any CPU at all when idling.
"htop" shows no significant usage on any of the processes there either, and sensor values reads around 80-98 degrees on the package constantly. So I swithced over to Windows for now.