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[Qemu-devel] [Bug 1834113] Re: QEMU touchpad input erratic after wakeup

From: Avi Eis
Subject: [Qemu-devel] [Bug 1834113] Re: QEMU touchpad input erratic after wakeup from sleep
Date: Wed, 03 Jul 2019 22:18:14 -0000

1. seems like same issue on older intel-microcode.

2. I checked xev on the guest while issue was occuring with the
following results:

when moving the cursor, a buttonpress event is generated along with a
bunch of motionnotify events. After moving it, if I click or touch the
touchpad without moving it it shows only a buttonrelease but no

This is consistent with the behavior I'm seeing: when I move, it's as if
I clicked right before, producing the dragging motion. And once it's
registered buttonpress, another buttonpress event won't be generated
until a buttonrelease one is generated.

xev works as expected on the host.

The issue is a phantom buttonpress event being generated on the guest

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  QEMU touchpad input erratic after wakeup from sleep

Status in QEMU:
Status in libvirt package in Ubuntu:
Status in qemu package in Ubuntu:

Bug description:
  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
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2019-02-20 (124 days ago)
  InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 
   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
   PATH=(custom, no user)
  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.product.family: Precision
  dmi.product.name: Precision 5530
  dmi.product.sku: 087D
  dmi.sys.vendor: Dell Inc.

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