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[Maksim Lin <maks@xxxxxxxxxxxxx>]

Yep see exactly the same thing here on a Dell Latitude 7440 with Haswell
i7 4600U.

As an extra data point, I'm running a newer kernel:
uname -a
Linux e7440 3.15.0-031500rc2-generic #201404201435 SMP Sun Apr 20 18:36:18 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1322751

Title:
  Compiz running on Intel Haswell GPU has 100% CPU usage when computer
  is locked

Status in compiz package in Ubuntu:
  Confirmed

Bug description:
  I have Ubuntu 14.04 installed on a Lenovo X1 Carbon series 2. Whenever
  I lock my screen, compiz's CPU usage goes through the roof and it
  causes the CPU fan to spin up to max speed. I SSH'ed into the machine
  while it was locked to verify that it was indeed the compiz process
  causing the high cpu usage. When I unlock my computer, everything goes
  back to normal.

  I've looked at
  https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/969860, which
  seems related but that is for fglrx. This laptop has an Intel Haswell
  gpu.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: compiz 1:0.9.11+14.04.20140423-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3.2
  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
  Date: Fri May 23 14:01:48 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:2218]
  InstallationDate: Installed on 2014-05-15 (8 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20A8S0UU00
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=3bc1f0cb-5a0d-45e6-a19a-ba71b7bc4c84 ro quiet splash vt.handoff=7
  SourcePackage: compiz
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/26/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GRET36WW (1.13 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20A8S0UU00
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 Pro
  dmi.chassis.asset.tag: CS0000064833
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGRET36WW(1.13):bd03/26/2014:svnLENOVO:pn20A8S0UU00:pvrThinkPadX1Carbon2nd:rvnLENOVO:rn20A8S0UU00:rvrSDK0E50510Pro:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20A8S0UU00
  dmi.product.version: ThinkPad X1 Carbon 2nd
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
  xserver.bootTime: Fri May 23 10:55:01 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               61457 
   vendor                                     DEL
  xserver.version: 2:1.15.1-0ubuntu2

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