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[nicolas_dh <1314367@xxxxxxxxxxxxxxxxxx>]

Your Workaround:
  ccsm Utility->Workaround->"Force full screen redraws (buffer swap) on repaint" [x]
stopped "flickering" also for me:
with NVIDIA's 343.22 (Latest Short Lived Branch version) on Ubuntu 14.04 amd64 with GeForce GTX 550 Ti

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https://bugs.launchpad.net/bugs/1314367

Title:
  Flickering with Ubuntu 14.04 and nvidia card reappeared

Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  As requested in Bug #1310633 I'm opening a new bug.

  With a previous version of Ubuntu I already had this flickering. With
  additional options for the kernel module I was able to fix the
  flickering.

  options nvidia NVreg_RegistryDwords="PerfLevelSrc=0x2222"
  NVreg_Mobile=3 NVreg_ModifyDeviceFiles=0

  With version 14.04 and the nvidia-331 (331.38-0ubuntu7) driver the
  flickering reappeared although the line is still present in
  options.conf.

  Using modprobe --resolve-alias nvidia I found the correct driver
  module name which in my case is nvidia_331. Changing the module name
  in options.conf to nvidia_331 X doesn't start anymore. Removing the
  NVreg_ModifyDeviceFiles option X is starting again, but does not solve
  the issue.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: xorg 1:7.7+1ubuntu8
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  331.38  Wed Jan  8 19:32:30 PST 2014
   GCC version:  gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: Unity
  Date: Tue Apr 29 21:09:41 2014
  DistUpgraded: 2014-04-17 23:47:50,572 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.13.0-24-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-24-generic, x86_64: installed
   vboxhost, 4.3.10, 3.13.0-24-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation GT215GLM [Quadro FX 1800M] [10de:0cbc] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company Device [103c:1521]
  InstallationDate: Installed on 2012-11-17 (528 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: Hewlett-Packard HP EliteBook 8540w
  PccardctlStatus:
   Socket 0:
     3.3V
    16-bit
    PC Card
     Subdevice 0 (function 0) bound to driver "pata_pcmcia"
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=c6af930a-63f1-4015-9c42-bdde793e3e5a ro quiet splash
  SourcePackage: xorg
  UpgradeStatus: Upgraded to trusty on 2014-04-17 (11 days ago)
  dmi.bios.date: 09/13/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68CVD Ver. F.24
  dmi.board.name: 1521
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 32.35
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68CVDVer.F.24:bd09/13/2013:svnHewlett-Packard:pnHPEliteBook8540w:pvr:rvnHewlett-Packard:rn1521:rvrKBCVersion32.35:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 8540w
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  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.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  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
  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: Tue Apr 29 21:06:04 2014
  xserver.configfile: default
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.15.1-0ubuntu2

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