[Bug 105718] amdgpu reported fan speed looks too high (dual fan Sapphire Pulse Vega 56)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105718

--- Comment #1 from Wilko Bartels <me at jasondaigo.de> ---
(In reply to Shmerl from comment #0)
> I have Sapphire Pulse Vega 56, which ships with two fans. According to this:
> https://www.youtube.com/watch?v=3mKSrSluxbM&t=1m25s
> in a normal scenario, fans should spin at under 650 RPM. However sensors
> report for idle load around 1280 RPM for me, which looks like a double value
> of the above:
> 
> amdgpu-pci-2f00
> Adapter: PCI adapter
> fan1: 1281 RPM
> temp1: +29.0°C (crit = +0.0°C, hyst = +0.0°C)
> 
> pwm1 is set to auto:
> 
> sudo cat /sys/class/drm/card0/device/hwmon/hwmon3/pwm1_enable
> 2
> 
> Is this a misdetection, or it's supposed to be like that? Actual fans are
> pretty silent.
> 
> System: Debian testing, x86_64 (kernel 4.15.4).

i notice the same for my vega pulse.
in ur example im pretty sure the fans are even off.they should at such a low
temp. the rpm information seems to work as long at it goes up. but when the
temperature falls below 55°C the fan are going to stop and the rpm info doesnt
get updated anymore and stays there.

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