[TRACKING] AMD FW13 fan speed jumps up high, drops quickly back to low / off

[Charlie_6]

@TomsonTom

when I run benchmarks that make the CPU go to 95°C, the fans take about 30 seconds to turn on and stay on for quite a while

This is not a bug, but whether it’s desired is up to interpretation.

@Charlie_6

AFAIK the fan control monitors the cpu_f75303@4d which is NOT the CPU temperature, the actual CPU temperature is cpu@4c but the fan only starts when the CPU is already thermal shutdown(103 C and 105 C), as shown

$ sudo ectool temps all
--sensor name -------- temperature -------- ratio (fan_off and fan_max) --
local_f75303@4d       319 K (= 46 C)          20% (313 K and 343 K)
cpu_f75303@4d         321 K (= 48 C)          25% (319 K and 327 K)
ddr_f75303@4d         315 K (= 42 C)        N/A (fan_off=401 K, fan_max=401 K)
cpu@4c                365 K (= 92 C)           0% (376 K and 378 K)

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update edit

@TomsonTom

I am doing nothing demanding, I have HWiNFO64 open to monitor the CPU temperatures, there are no spikes visible, and suddenly Framework turns on the fan to high speed for about 1 second, and then they turn off completely again.

I found a way to replicate this. The “turn off completely again” is actually turned to 3% (the lowest PWM) then 0%.

If you are in a cold environment and just benchmark the CPU i.e sensor temperature passes the fan_off temp quickly, the fan will speed up gradually and if you then stop the benchmarking the CPU will slow down smoothly untli a complete stop.

However, if you are in a warm environment doing nothing demanding, the sensor’s temperature might stay at exactly at the fan_off i.e 313K for local_f75303@4d and/or 319K for cpu_f75303@4d and if the temperature changes very very slowly i.e. changing from 312K to 313K or from 313K to 314K in several minutes, the fan controller might freak out, sending 100% PWM in a fracton of second.