Re: "SOLVED": Precision (M4700/M4800) Relentless F
What bios-version are you running? I recently bought a used M4800 and I had the same issue. The fan could start for no apparent reason and make a lot of noise. Regulating extremely unevenly at low temperatures sometimes.
I'm running Ubuntu 18.04, but I tested it out with Windows 10 also and it made no difference. Last night I upgraded the bios from A06 to A25 and there was a substantial difference. Something changed, and I am hopeful that it resolved the issue for me at least. I guess time will tell.