Public bug reported:

Traditionally I set Caps Lock to switch between input languages (en/ru for me). 
If I lock a screen and press Caps Lock to switch between languages to enter 
password in correct language, the screen is flickering and compiz crashes in 
background.
--- 
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
DistUpgraded: Fresh install
DistroCodename: xenial
DistroRelease: Ubuntu 16.04
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo 2nd Generation Core Processor Family Integrated Graphics 
Controller [17aa:21da]
GsettingsChanges:
 org.compiz.core outputs ['1366x768+0+0']
 org.compiz.core hsize 2
 org.compiz.core active-plugins ['core', 'composite', 'opengl', 'snap', 
'vpswitch', 'compiztoolbox', 'copytex', 'commands', 'wall', 'mousepoll', 
'resize', 'move', 'place', 'imgpng', 'session', 'regex', 'grid', 'animation', 
'fade', 'expo', 'unitymtgrabhandles', 'workarounds', 'scale', 'ezoom', 
'unityshell']
 org.compiz.core vsize 2
InstallationDate: Installed on 2016-08-07 (2 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
LightdmDisplayLog:
 (II) AIGLX: Suspending AIGLX clients for VT switch
 [dix] couldn't enable device 12
 (II) Server terminated successfully (0). Closing log file.
MachineType: LENOVO 4286CTO
Package: compiz 1:0.9.12.2+16.04.20160714-0ubuntu1
PackageArchitecture: all
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-34-generic 
root=/dev/mapper/xenial_thinkpad-vg_xenial_root ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.4.0-34.53-generic 4.4.15
Tags:  xenial xenial ubuntu compiz-0.9
Uname: Linux 4.4.0-34-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 07/07/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET50WW (1.20 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4286CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvr8DET50WW(1.20):bd07/07/2011:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4286CTO
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.12.2+16.04.20160714-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.1
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: apport-collected capslock compiz compiz-0.9 input switch ubuntu xenial

** Project changed: ubuntu-mate => unity

** Also affects: ubuntu
   Importance: Undecided
       Status: New

** No longer affects: unity

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https://bugs.launchpad.net/bugs/1611838

Title:
  Compiz crashes on unlock screen if CapsLock is set to switch input
  source

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