That's correct.  And it hadn't happened for a while now but just
happened again yesterday.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1576546

Title:
  random letters don't display after resume from sleep

Status in xserver-xorg-video-intel package in Ubuntu:
  Incomplete

Bug description:
  When I resume from a long suspend in Xenial, I find that most of the
  letters do not display.  I can copy and paste them into chat windows
  and people see them on the other side, but they do not show up
  visibly.  The menu items for suspend/shut down/log out usually vanish
  as well, which makes it hard to find a good solution.

  I find that killing my session manager restarts X and everything goes
  back to normal on next login.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2
  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 Apr 29 08:06:26 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  DkmsStatus:
   sysdig, 0.8.0, 4.4.0-17-generic, x86_64: installed
   sysdig, 0.8.0, 4.4.0-18-generic, x86_64: installed
   sysdig, 0.8.0, 4.4.0-21-generic, x86_64: installed
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo ThinkPad X240 [17aa:2214]
  GsettingsChanges:
   b'org.compiz.core' b'outputs' b"['1920x1080+0+0']"
   b'org.compiz.core' b'hsize' b'2'
   b'org.compiz.core' b'active-plugins' b"['core', 'composite', 'opengl', 
'imgpng', 'commands', 'snap', 'copytex', 'resize', 'place', 'compiztoolbox', 
'regex', 'move', 'grid', 'wall', 'vpswitch', 'mousepoll', 'unitymtgrabhandles', 
'session', 'animation', 'workarounds', 'expo', 'fade', 'ezoom', 'scale', 
'unityshell']"
   b'org.compiz.core' b'vsize' b'2'
  InstallationDate: Installed on 2014-05-29 (700 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20ALCTO1WW
  PackageArchitecture: all
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: compiz
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/06/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GIET69WW (2.19 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20ALCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvrGIET69WW(2.19):bd02/06/2014:svnLENOVO:pn20ALCTO1WW:pvrThinkPadX240:rvnLENOVO:rn20ALCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20ALCTO1WW
  dmi.product.version: ThinkPad X240
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+16.04.20160415-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  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
  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: Wed Apr 27 21:22:16 2016
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1079 
   vendor                                     LGD
  xserver.version: 2:1.18.3-1ubuntu2

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