Passing through any USB device to VM stops C-states leading to high idle power use

ab7KNgN7k

New Member
Dec 31, 2024
1
0
1
Whenever I passthrough any USB device to a VM, C-states stop working and the idle power usage go from 9w to 20w. I experienced it with the BT adapter passthrough in my HAOS VM and RTLSDR v4 with DragonOS VM. Removing these devices from the "hardware" tab restores the power save functionality.

Is this a known issue, and can I fix it somehow? Please let me know if I can provide more info.
 

About

The Proxmox community has been around for many years and offers help and support for Proxmox VE, Proxmox Backup Server, and Proxmox Mail Gateway.
We think our community is one of the best thanks to people like you!

Get your subscription!

The Proxmox team works very hard to make sure you are running the best software and getting stable updates and security enhancements, as well as quick enterprise support. Tens of thousands of happy customers have a Proxmox subscription. Get yours easily in our online shop.

Buy now!