OT maybe interesting

[James]

I've been a long time macports user.

My mid 2011 iMac27 is pegged at High Sierra. I can't build recent mythtv 
and other woes, after a fail flirt with opencore I installed linux.

I asked on the various user forums, but got only well intentioned naive 
answers.

Is fan control done by hardware?

If so why: https://github.com/Hipuranyhou/macfand

I did a faily heavy shotcut render. At the point I chickened out cpu fan 
was at minimum (1200 rpm) and core were at 55C

Do I need to do sw control of the fans? (Chickened out means I dialed 
the fans to FSD and temp came down to 40C)

James