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[Launchpad Bug Tracker <1675357@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package mir - 0.26.3+17.10.20170526.3-0ubuntu1

---------------
mir (0.26.3+17.10.20170526.3-0ubuntu1) artful; urgency=medium

  [ Daniel van Vugt ]
  * New upstream release 0.26.3 (https://launchpad.net/mir/+milestone/0.26.3)
    - Enhancements:
      . Make deprecations optional (and default to off for builds on 16.04 LTS)
      . Added support for building on Ubuntu 17.10 artful.
    - Bugs fixed:
      . Mir needs to be updated to 0.26 in 16.04LTS (LP: #1685186)
      . unity-system-compositor crashed with SIGSEGV in
        libinput_device_config_accel_is_available() from
        libinput_device_config_accel_set_speed() from
        mir::input::evdev::LibInputDevice::apply_settings() (LP: #1672955)
      . Please transition to Boost 1.62 (LP: #1675138)
      . Mir sending key repeat events continually to nested shell after VT
        switch (causes Unity8 lockup for a while) (LP: #1675357)
      . mir_demo_standalone_render_overlays fails to link (LP: #1677239)

 -- Alan Griffiths <alan.griffiths@xxxxxxxxxxxxx>  Fri, 26 May 2017
16:57:20 +0000

** Changed in: mir (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1675357

Title:
  Mir sending key repeat events continually to nested shell after VT
  switch (causes Unity8 lockup for a while)

Status in Canonical System Image:
  In Progress
Status in Mir:
  Fix Committed
Status in Mir 0.26 series:
  Fix Committed
Status in mir package in Ubuntu:
  Fix Released
Status in qtmir package in Ubuntu:
  Invalid
Status in unity8 package in Ubuntu:
  Invalid
Status in mir source package in Xenial:
  Fix Committed
Status in qtmir source package in Xenial:
  Invalid
Status in unity8 source package in Xenial:
  Invalid

Bug description:
  Steps:
  * log in to unity8
  * Ctrl+Alt+F* to a different vt, or log in to a different user session
  * go back to the unity8 vt

  Expected:
  * session is locked, but working

  Current:
  * unity8 starts spinning for a time proportional to the period it was inactive
  * if it was inactive long enough, it doesn't seem to recover at all

  It seems it's "catching up" in some way, maybe with input, maybe
  frames.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: unity8 8.15+17.04.20170321-0ubuntu1 [origin: LP-PPA-ci-train-ppa-service-2555]
  ProcVersionSignature: Ubuntu 4.10.0-13.15-generic 4.10.1
  Uname: Linux 4.10.0-13-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
  ApportVersion: 2.20.4-0ubuntu2
  Architecture: amd64
  CurrentDesktop: Unity:Unity7
  Date: Thu Mar 23 11:36:39 2017
  InstallationDate: Installed on 2016-05-06 (320 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  SourcePackage: unity8
  UpgradeStatus: Upgraded to zesty on 2016-11-22 (120 days ago)

  Causes:
  The mir::input::KeyRepeatDispatcher is running inside the nested mirserver even though there is another instance running inside the host server. A few months ago qtmir used to replace the key repeater by replacing mirs  dispatcher. And key repeat is not disabled within the nested server. So both the host and the nested server are producing repeat events.
    Now due to a logic error inside mirserver the key repeat dispatcher is not hooked up to the input device hub when running inside the nested server. The input device hub would tell the key repeater when devices get removed - i.e. due to vt switching. So it never notices that the devices go away continues to produce those events indefinitely.

  This applies to all currently pressed buttons. I.e. you can open an
  edit field and press 'w' while simultaneously pressing Ctrl+Alt+FX to
  switch to another VT. On return 'w' will be repeated indefinitely.

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