[Bug 1906181] [NEW] Mouse starts jumping wildly on guest desktop

[johannes]

Public bug reported:

Sometimes mouse goes completely crazy and starts jumping around the
guest desktop by itself and becomes completely unusable.

This does not happen on every boot, only sometimes. It may be caused by
some input combination but I haven't yet found any specific cause. It
happens soon after the desktop has been loaded and rebooting seems to be
the only way to resolve the situation.


Guest: Kubuntu 20.04 64-bit (live), with KDE desktop
Host: Arch Linux, with KDE desktop
QEMU version: 5.1.0

QEMU start command:
qemu-system-x86_64 -enable-kvm -m 6G -cpu host -smp 3 -cdrom 
./linux/kubuntu-20.04-desktop-amd64.iso -boot d -vga virtio -soundhw hda 
-display sdl,gl=on

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: input linux mouse

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https://bugs.launchpad.net/bugs/1906181

Title:
  Mouse starts jumping wildly on guest desktop

Status in QEMU:
  New

Bug description:
  Sometimes mouse goes completely crazy and starts jumping around the
  guest desktop by itself and becomes completely unusable.

  This does not happen on every boot, only sometimes. It may be caused
  by some input combination but I haven't yet found any specific cause.
  It happens soon after the desktop has been loaded and rebooting seems
  to be the only way to resolve the situation.

  
  Guest: Kubuntu 20.04 64-bit (live), with KDE desktop
  Host: Arch Linux, with KDE desktop
  QEMU version: 5.1.0

  QEMU start command:
  qemu-system-x86_64 -enable-kvm -m 6G -cpu host -smp 3 -cdrom 
./linux/kubuntu-20.04-desktop-amd64.iso -boot d -vga virtio -soundhw hda 
-display sdl,gl=on

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