There's no standalone fan controller in existence I'm aware of with Linux support unfortunately, blame manufacturers for that. I use an aquacomputer quadro and just fire up a windows VM with USB passthrough to change settings the once or twice a year I need to. What else isn't working?
Regarding blender, what render options are missing? If it's GPU rendering that's missing, are you using Nvidia or AMD? I'm not familiar with how mint does things but you might need cuda or HIP packages for Nvidia or AMD respectively.