Public bug reported:

Using Ubuntu host and guest. Normally the touchpad works great. Within
the last few days, suddenly, apparently after a wake from sleep, the
touchpad will behave erratically. For example, it will take two clicks
to select something, and when moving the cursor it will act as though it
is dragging even with the button not clicked.

A reboot fixes the issue temporarily.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: qemu 1:3.1+dfsg-2ubuntu3.1
Uname: Linux 5.1.14-050114-generic x86_64
ApportVersion: 2.20.10-0ubuntu27
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Jun 24 20:55:44 2019
Dependencies:
 
EcryptfsInUse: Yes
InstallationDate: Installed on 2019-02-20 (124 days ago)
InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 
20180608-09:38
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 8087:0025 Intel Corp. 
 Bus 001 Device 003: ID 0c45:671d Microdia 
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. Precision 5530
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.1.14-050114-generic 
root=UUID=18e8777c-1764-41e4-a19f-62476055de23 ro mem_sleep_default=deep 
mem_sleep_default=deep acpi_rev_override=1 scsi_mod.use_blk_mq=1 
nouveau.modeset=0 nouveau.runpm=0 nouveau.blacklist=1 acpi_backlight=none 
acpi_osi=Linux acpi_osi=!
SourcePackage: qemu
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 04/26/2019
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.10.1
dmi.board.name: 0FP2W2
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.10.1:bd04/26/2019:svnDellInc.:pnPrecision5530:pvr:rvnDellInc.:rn0FP2W2:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Precision
dmi.product.name: Precision 5530
dmi.product.sku: 087D
dmi.sys.vendor: Dell Inc.

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug disco

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https://bugs.launchpad.net/bugs/1834113

Title:
  QEMU touchpad input erratic after wakeup from sleep

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