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As the title, I passthrough my AMD 7850 to a Windows guest VM, so I needed to blacklist the driver on the host. But I recently realize that when the guest is running the fan on the GPU is running at a lower speed with less noise, which apparently is controlled by the card driver in the guest. When the guest VM shuts down, the fan returns to a higher speed which presumably is the normal speed when the driver release control and everything goes to the 'normal' state. The issue is the noise is greater. I tried to use lm-sensor but it cannot discover the sensor on the GPU. So the question is that if there is any wah to adjust the fan speed?
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I'm not sure if you've already read through this, but there appears to be an Arch wiki page explaining fan control options:
https://wiki.archlinux.org/index.php/Fan_speed_control
There is a section called "amdgpu sysfs fan control" which indicates that the amdgpu kernel driver supports fan control. I'm not sure if that would address your problem. I haven't tried to control the fan speed on my graphics card.
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Acoording to that wiki, the first file needed to enable manual fan control is this one but it does not exists on my system.
/sys/class/drm/card0/device/hwmon/hwmon0/pwm1_enable
Any idea?
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