Power Consumption passed through GPU when VM is Off

[toomanylogins]

I have passed through a graphics card for virtual machine I use rarely. Mainly for for testing so it's generally off. However I have noticed the graphic card heatsink is warm so using a bit of power. Is there any way this can be disabled ?
Thanks
Paul

 

[dcsapak]

i don't think there is a direct way. normally the devices power state is managed by e.g. the driver
(you can check the acpi power state in /sys/bus/pci/devices/<address>/power_state)
so if no driver is loaded, there'll be nobody responsible for putting the device in a low power state
(you could try to load a driver on the host when the vm is off though)

 

[toomanylogins]

Thanks for the tip. I will check the power state.
Paul

 

[bluestormx]

i have two graphics cards installed. both are passed through. the first is connected to a monitor and is used as the main computer. the second is used for game streaming via moonlight.
as soon as i shut down my main vm, my graphics card does not shut down, instead the fans speed up.

how can i prevent this?

 

[leesteken]

i have two graphics cards installed. both are passed through. the first is connected to a monitor and is used as the main computer. the second is used for game streaming via moonlight.
as soon as i shut down my main vm, my graphics card does not shut down, instead the fans speed up.

how can i prevent this?

Did you notice this post?

so if no driver is loaded, there'll be nobody responsible for putting the device in a low power state
(you could try to load a driver on the host when the vm is off though)

This can be done by unbinding the vfio-pci driver and binding the Linux device driver (like amdgpu or nouveau) for your GPU.
Or don't shutdown the VM and let it idle and keep the GPU in low power state.
EDIT: Or create a small VM (with the GPU drivers installer) that does nothing and start that VM to keep the GPU in low power state.

 

[iamanewuser]

It don't have this problem on my PVE, I have GTX 1060 graphics card passed through for windows10 virtual machine, when I shutdown or hibernate virtual machine, the graphics card keeping quiet.