[Bug 202019] amdgpu: fan speed reported incorrectly when the fan is off

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https://bugzilla.kernel.org/show_bug.cgi?id=202019

Aleksandr Mezin (mezin.alexander@xxxxxxxxx) changed:

           What    |Removed                     |Added
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           Severity|normal                      |low

--- Comment #3 from Aleksandr Mezin (mezin.alexander@xxxxxxxxx) ---
(In reply to Felix Schwarz from comment #1)
> Probably a silly question but still: Did you confirm (visually) that the
> fans are actually turned off? 

Yes

> AFAIK on Windows there is extra software
> running which turns of the fans when the GPU temperature is below a certain
> threshold. IIRC you need third-party scripts to achieve the same.

On Windows I have no additional software, only AMD driver (downloaded from
amd.com, not modded by Sapphire or anything).

Actually, I have my own script that controls fans on Linux (because there's no
sysfs knobs to tweak the "automatic" fan curve), it just checks the temperature
every second and writes desired fan speed to hwmon/pwm1. I tried to manually
write '0' to pwm1 (with pwm1_enable set to '1') - exactly the same bug -
fan1_input stops changing (when the fan is actually spinning, fan speed is
always slightly changing, +/- few rpms), but doesn't show "0" (and, again, the
fans are actually stopped)

This problem occurs with both "pwm1_enable=2" and "pwm1_enable=1, pwm1=0"

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