no lockup today.  probably because i used far fewer firefox tabs.  i
suspect xorg gets into trouble under the strain of thrashing.  i suspect
this is a new issue because the new version of firefox recently
introduced into xenial has a significantly larger memory footprint.
tomorrow perhaps i'll try with more tabs open.

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  [Dell OptiPlex 755] PC freezes while playing vlc or youtube

Status in xorg package in Ubuntu:

Bug description:
  When watching youtube or vlc, xorg CPU utilization increases, until
  overall CPU utilization pegs at 100%. The sound plays on a bit further
  and then stops. The mouse can move the cursor but cannot interact with

  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  CompizPlugins: No value set for 
  CompositorRunning: None
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroRelease: Ubuntu 16.04
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
   Intel Corporation 82Q35 Express Integrated Graphics Controller [8086:29b2] 
(rev 02) (prog-if 00 [VGA controller])
     Subsystem: Dell OptiPlex 755 [1028:0211]
     Subsystem: Dell OptiPlex 755 [1028:0211]
  InstallationDate: Installed on 2016-10-15 (478 days ago)
  InstallationMedia: Lubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
  MachineType: Dell Inc. OptiPlex 755
  Package: xorg 1:7.7+13ubuntu3
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz ro 
root=UUID=31a5bed5-4d43-4da3-a094-17c3f23ae8b1 panic=30
  ProcVersionSignature: Ubuntu 4.4.0-112.135-generic 4.4.98
  Tags:  xenial ubuntu
  Uname: Linux 4.4.0-112-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm admin cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True 04/30/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10 0PU052
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 15
  dmi.chassis.vendor: Dell Inc.
dmi:bvnDellInc.:bvrA10:bd04/30/2008:svnDellInc.:pnOptiPlex755:pvr:rvnDellInc.:rn0PU052:rvr:cvnDellInc.:ct15:cvr: OptiPlex 755
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.83-1~16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.4-0ubuntu1~16.04.4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.4-0ubuntu1~16.04.4
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-0ubuntu0.7
  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 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 

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