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[Bug 1516308] [NEW] Compiz uses 100% CPU when desktop is locked


Public bug reported:

Tested on three different machines upgraded to Ubuntu 15.10 recently.
All of them are 32 bit systems, two of them are intel based integrated
GPU (on of them is notebook) with intel CPU, and one is AMD APU equipped
machine with the binary driver (so because of this, I don't think it's a
video driver related issue). The problem: I've noticed that after
locking the screen the fan of the notebook starts to produce a louder
noise, typical sign of high CPU usage. After logging in into the machine
via ssh from another one, I found that compiz uses 100% CPU, but after
unlock the CPU usage drops below 1%. Then I noticed the same with two
desktop machines, the same: 100% used CPU by compiz when locked. It's
really annoying since it didn't happen with the previous Ubuntu release,
and it creates significant noise by the fans, and of course - I guess -
using more energy than it should.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: compiz 1:
ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
Uname: Linux 4.2.0-18-generic i686
ApportVersion: 2.19.1-0ubuntu4
Architecture: i386
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: Sat Nov 14 21:53:55 2015
DistUpgraded: 2015-10-18 23:18:25,282 INFO cache.commit()
DistroCodename: wily
DistroVariant: ubuntu
 virtualbox, 5.0.4, 4.2.0-17-generic, i686: installed
 virtualbox, 5.0.4, 4.2.0-18-generic, i686: installed
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21dd]
InstallationDate: Installed on 2012-03-03 (1351 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
MachineType: LENOVO 5016NW6
PackageArchitecture: all
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=8df578aa-47e3-483f-b694-bf7effd24b7d ro i915.semaphores=0 quiet splash vt.handoff=7
SourcePackage: compiz
UpgradeStatus: Upgraded to wily on 2015-10-18 (26 days ago)
dmi.bios.date: 11/04/2011
dmi.bios.vendor: LENOVO
dmi.bios.version: 8GET38WW (1.15 )
dmi.board.name: 5016NW6
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:bvr8GET38WW(1.15):bd11/04/2011:svnLENOVO:pn5016NW6:pvrThinkPadL520:rvnLENOVO:rn5016NW6:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 5016NW6
dmi.product.version: ThinkPad L520
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Fri Nov 13 17:02:38 2015
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
 product id                                9196 
 vendor                                     AUO
xserver.version: 2:1.17.2-1ubuntu9

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

** Tags: apport-bug compiz-0.9 i386 ubuntu wily

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  Compiz uses 100% CPU when desktop is locked

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