Created attachment 143743 [details]
dmesg

On manual fan control through pwm interface, the used value on pwm1 is lesser
that the requested value (except for maximum).
For example:
echo 1 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1_enable

echo 10 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
5

echo 100 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
96

echo 254 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
249

The maximum value works as expected:
echo 255 > /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
cat /sys/class/drm/card0/device/hwmon/hwmon1/pwm1
255

Other info:
Hardware: MSI RX480 Gaming (Polaris)
Kernel: linux 5.0.2

Please, let me know if more info is needed.
Thanks.