M1 Max: no SoC thermal zones, fans don't ramp up, system freezes under load

[olosegres]

Hi,

Fans on my MacBook Pro 16" M1 Max (2021), kernel 6.18.15-400.asahi.fc42.aarch64+16k are detected by macsmc-hwmon but never ramp up under load. The system has no CPU/GPU thermal zones, only macsmc-battery. Fans are not registered as cooling devices. Under sustained load the machine throttles and eventually freezes.

$ cat /sys/class/thermal/thermal_zone*/type
macsmc-battery
$ cat /sys/class/thermal/cooling_device*/type
PCIe_Port_Link_Speed_0000:00:00.0
PCIe_Port_Link_Speed_0000:00:01.0
dmesg shows:
hwmon hwmon1: temp1_input not attached to any thermal zone
hwmon hwmon1: temp2_input not attached to any thermal zone
hwmon hwmon1: temp3_input not attached to any thermal zone
hwmon hwmon1: temp4_input not attached to any thermal zone

No Apple-specific driver in drivers/thermal/, no thermal entries in device tree.

Is there a plan to wire SMC/SoC thermal sensors into the thermal framework with fans as cooling devices? Or is the SMC firmware expected to handle this autonomously, and if so, is M1 Max a known gap?