https://bugzilla.kernel.org/show_bug.cgi?id=119211
--- Comment #3 from Stas Sergeev stsp@list.ru --- Essentially, when driver initializes, it puts 0 to /sys/class/hwmon/hwmon0/pwm1. And unless you set up fancontrol (which is a major pita), this 0 remain there, no matter how you load you GPU. It should put some other value there, like 50 or more. On my system 50 is a minimum value needed to get the GPU fan rotating.