Public bug reported:

Show desktop hot corner only works once, after this the hot-corner
doesn't activate again. Solution found here:
https://askubuntu.com/questions/419205/show-desktop-with-hot-corners-
not-working

["Moving every single option in compiz settings manager i did find that
when unity was disable then SHOW DESKTOP works as expected with the HOT
CORNERS.

So i click every single checkmark in UBUNTU UNITY PLUGIN to finally find
that SHOW LIVE PREVIEWS OF WINDOWS IN THE SWITCHER was the one to blame.
(After uncheck it then hot corners works as expected, phew!)." ]

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.0+16.04.20160526.1-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
BootLog:
 
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
Date: Mon Jul 18 10:35:28 2016
DistUpgraded: 2016-07-13 09:59:41,630 DEBUG icon theme changed, re-reading
DistroCodename: xenial
DistroVariant: ubuntu
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller 
[8086:0152] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Gigabyte Technology Co., Ltd Xeon E3-1200 v2/3rd Gen Core 
processor Graphics Controller [1458:d000]
InstallationDate: Installed on 2016-01-02 (197 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
ProcEnviron:
 PATH=(custom, no user)
 SHELL=/bin/bash
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:en
 XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic 
root=UUID=f5218c70-25bf-4eea-973c-ef3e11258a2f ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to xenial on 2016-07-13 (5 days ago)
dmi.bios.date: 02/25/2013
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: FH
dmi.board.asset.tag: To be filled by O.E.M.
dmi.board.name: H61M-S2PV
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrFH:bd02/25/2013:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH61M-S2PV:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To be filled by O.E.M.
dmi.product.version: To be filled by O.E.M.
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
upstart.unity-panel-service-lockscreen.log: (unity-panel-service:17388): 
GLib-CRITICAL **: Source ID 4294967295 was not found when attempting to remove 
it
version.compiz: compiz 1:0.9.12.2+16.04.20160526-0ubuntu1
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
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
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
xserver.bootTime: Mon Jul 18 08:50:37 2016
xserver.configfile: default
xserver.devices:
 input        Power Button         KEYBOARD, id 6
 input        Video Bus            KEYBOARD, id 7
 input        Power Button         KEYBOARD, id 8
 input        PixArt USB Optical Mouse MOUSE, id 9
 input        AT Translated Set 2 keyboard KEYBOARD, id 10
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.18.3-1ubuntu2.2

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


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial

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https://bugs.launchpad.net/bugs/1603931

Title:
  Show desktop hot corner doesn't activate properly

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