[SOLVED] Proxmox 6.0.5 - WIN10 VM 100% CPU Usage when idle


Active Member
May 4, 2016
proxmox-ve: 6.0-2 (running kernel: 5.0.18-1-pve)
pve-manager: 6.0-5 (running version: 6.0-5/f8a710d7)
pve-kernel-5.0: 6.0-6
pve-kernel-helper: 6.0-6
pve-kernel-5.0.18-1-pve: 5.0.18-1
pve-kernel-5.0.15-1-pve: 5.0.15-1
ceph-fuse: 12.2.11+dfsg1-2.1
corosync: 3.0.2-pve2
criu: 3.11-3
glusterfs-client: 5.5-3
ksm-control-daemon: 1.3-1
libjs-extjs: 6.0.1-10
libknet1: 1.10-pve1
libpve-access-control: 6.0-2
libpve-apiclient-perl: 3.0-2
libpve-common-perl: 6.0-3
libpve-guest-common-perl: 3.0-1
libpve-http-server-perl: 3.0-2
libpve-storage-perl: 6.0-6
libqb0: 1.0.5-1
lvm2: 2.03.02-pve3
lxc-pve: 3.1.0-61
lxcfs: 3.0.3-pve60
novnc-pve: 1.0.0-60
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.0-5
pve-cluster: 6.0-4
pve-container: 3.0-5
pve-docs: 6.0-4
pve-edk2-firmware: 2.20190614-1
pve-firewall: 4.0-6
pve-firmware: 3.0-2
pve-ha-manager: 3.0-2
pve-i18n: 2.0-2
pve-qemu-kvm: 4.0.0-3
pve-xtermjs: 3.13.2-1
qemu-server: 6.0-7
smartmontools: 7.0-pve2
spiceterm: 3.1-1
vncterm: 1.6-1
zfsutils-linux: 0.8.1-pve1

# cat /etc/pve/qemu-server/100.conf
agent: 1
balloon: 0
bios: ovmf
bootdisk: scsi0
cores: 4
cpu: host,flags=+md-clear;+hv-tlbflush
cpuunits: 512
efidisk0: local-lvm:vm-100-disk-1,size=4M
machine: q35
memory: 4096
name: win10
net0: virtio=xxx,bridge=vmbr0
numa: 0
ostype: win10
scsi0: local-lvm:vm-100-disk-0,cache=writeback,discard=on,size=32G,ssd=1
scsihw: virtio-scsi-single
smbios1: uuid=xxx
sockets: 1
vmgenid: xxx

once i start a RDP session it goes back to 0-1%. Is this a known issue?

Windows is 10 pro with version 1903
Last edited:

Also take a look at this link

!'m running 18 Windows 10 Pro with Tablet = No / Spice video ( qxl ) and I see no problem.


Ricardo Jorge
Still 100% with tablet = no and Spice. it was a good suggestion. However. I haven't seen this issue before.

This is the configuration I'm using :

agent: 1
args: -device intel-hda,id=sound5,bus=pci.0,addr=0x18 -device hda-micro,id=sound5-codec0,bus=sound5.0,cad=0 -device hda-duplex,id=sound5-codec1,bus=sound5.0,cad=1
boot: cdn
bootdisk: scsi0
cores: 2
memory: 3072
name: WS-XXXXX
net0: virtio=11:22:33:44:55:66,bridge=vmbr0
numa: 0
ostype: win10
scsi0: local-zfs:vm-210-disk-0,size=32G
scsihw: virtio-scsi-pci
smbios1: uuid=XXXXXXXXXXXXX
sockets: 1
tablet: 0
usb0: spice
vga: qxl

Virtio 1.61

Ballooning is enabled but Min / Max memory have the same value.

This configuration was created on PVE 5.2X but now I'm running 6.0-5

I hope this helps.


Ricardo Jorge

Managed to solve the problem. It's an issue related to graphics driver after the 1903 update and it's a known issue.
The issue manifests after initiating an RDP session, then exiting the session without the logout of the user.

To replicate the issue:
  1. Create a Windows 10 1903 VM (CPU should be at ~0-1% idle)
  2. Access the VM via RDP connection
  3. Close the connection (CPU should be at ~20-30% idle, depending on the number of sessions and CPU settings)
Details: https://answers.microsoft.com/en-us...em-after/dbce0938-60c5-4051-81ef-468e51d743ab

The solution

As a workaround on all of my affected machines I have used Group Policy Editor to set:

Local Computer Policy
⌞ Computer Configuration
 ⌞ Administrative Templates
  ⌞ Windows Components
   ⌞ Remote Desktop Service
    ⌞ Remote Desktop Session Host
     ⌞ Remote Session Environment
      ⌞ Use WDDM graphics display driver for Remote Desktop Connections


This forces RDP to use the old (and now deprecated XDDM drivers).

After the reboot, the idle should go to the normal 0-1%.
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