High CPU usage of USB Tablet Device in Debian

pakradm

Renowned Member
Oct 24, 2016
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1
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Hello,

I'm created a virtual machine & install Debian 9.4 on it. when it's idle, the proxmox & top command in host report about 4% cpu usage.
After investigation I have found that if I disable "Use Tablet for Pointer" the problem will solve & host cpu usage will down to 0.7%.

Code:
proxmox-ve: 5.2-2 (running kernel: 4.15.17-1-pve)
pve-manager: 5.2-1 (running version: 5.2-1/0fcd7879)
pve-kernel-4.15: 5.2-1
pve-kernel-4.15.17-1-pve: 4.15.17-9
pve-kernel-4.13.16-3-pve: 4.13.16-50
corosync: 2.4.2-pve5
criu: 2.11.1-1~bpo90
glusterfs-client: 3.8.8-1
ksm-control-daemon: 1.2-2
libjs-extjs: 6.0.1-2
libpve-access-control: 5.0-8
libpve-apiclient-perl: 2.0-4
libpve-common-perl: 5.0-31
libpve-guest-common-perl: 2.0-16
libpve-http-server-perl: 2.0-8
libpve-storage-perl: 5.0-23
libqb0: 1.0.1-1
lvm2: 2.02.168-pve6
lxc-pve: 3.0.0-3
lxcfs: 3.0.0-1
novnc-pve: 0.6-4
proxmox-widget-toolkit: 1.0-18
pve-cluster: 5.0-27
pve-container: 2.0-23
pve-docs: 5.2-3
pve-firewall: 3.0-8
pve-firmware: 2.0-4
pve-ha-manager: 2.0-5
pve-i18n: 1.0-5
pve-libspice-server1: 0.12.8-3
pve-qemu-kvm: 2.11.1-5
pve-xtermjs: 1.0-5
qemu-server: 5.0-26
smartmontools: 6.5+svn4324-1
spiceterm: 3.0-5
vncterm: 1.5-3
zfsutils-linux: 0.7.8-pve1~bpo9
 
in recent distros (like debian 11) this should be resolved, since


/usr/lib/udev/rules.d/60-autosuspend.rules
and
/usr/lib/udev/hwdb.d/60-autosuspend.hwdb


containing
#########################################
# QEMU
#########################################
# Emulated USB HID devices
usb:v0627p0001:*QEMU USB Keyboard*
usb:v0627p0001:*QEMU USB Mouse*
usb:v0627p0001:*QEMU USB Tablet*
ID_AUTOSUSPEND=1


has been added to systemd (after ripped of long before, where it was working correctly).

https://github.com/systemd/systemd/commit/ec8bebbcc27ebbd9fa606743199c456ed5e3874c


my debian 11 vm is at 0.2% cpu when idle with "use tablet for pointer"=on