Make /sys/devices/system/cpu/intel_pstate/max_perf_pct persistent

Is it possible to make the value of /sys/devices/system/cpu/intel_pstate/max_perf_pct persistent? I have to do this to prevent overheating…

I currently set it every time manually after startup using echo 85 | sudo tee /sys/devices/system/cpu/intel_pstate/max_perf_pct but the value is reset every time I restart the machine.

You can create a systemd unit using systemd-backlight@.service as an example.

Hmm, yeah, that would be a solution. But actually I was hoping for a kernel parameter or something similar …