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[Xtien <1531845@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1531845

Title:
  Xorg freeze

Status in xorg package in Ubuntu:
  New

Bug description:
  I have multiple freezes per day, since a couple of months. I have gone
  back to Ubuntu 14.04, 15.04, same result. I have bought a new graphics
  card (went from GEforce460 to GEforce970), no change. I have a new cpu
  and motherboard, same result.

  What I see is that in System Monitor, CPU2 or CPU3 (there's 12, only 2 or 3 go to 100% during freeze) goes to 100% and stays there for 5 or more minutes. All other CPUs are at less than 5%. In the "processes" tab no processes use significant CPU. But when I go to a shell (ctrl-alt-F2) and type "top", I see Xorg taking ~50% CPU and 2.4% memory. 
  I can trigger this by starting Android Studio. Sometimes it happens in Gedit loading a large file, or in a shell window. I tried different versions of AS, different versions of Gradle, tried Oracle java instead of openjdk, no change.  Most of the times, Firefox also freezes after a short while, then everything freezes. The freeze does stop, after a maximum of 15 minutes. Sometimes, I need to do a hard reboot. 

  First time I saw this "one cpu at 100%" was in August of 2014, which may be when I first used Android Studio and Gradle. Unfortunately, going back to Eclipse and ant is not an option. 
  This takes about an hour of my time every day, so I'm willing to put a lot of effort in solving this.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-23.28-generic 4.2.6
  Uname: Linux 4.2.0-23-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  352.63  Sat Nov  7 21:25:42 PST 2015
   GCC version:  gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2)
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  BootLog:
   
  CurrentDesktop: Unity
  Date: Thu Jan  7 13:12:34 2016
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Since before I upgraded
  GraphicsCard:
   NVIDIA Corporation GM206 [GeForce GTX 960] [10de:1401] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:3205]
  InstallationDate: Installed on 2015-12-13 (24 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: MSI MS-7881
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-23-generic.efi.signed root=UUID=eea1d4c7-5f21-40a5-b73d-fed6b0a48f69 ro noprompt persistent quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/20/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1.70
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: X99S XPOWER AC (MS-7881)
  dmi.board.vendor: MSI
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.70:bd03/20/2015:svnMSI:pnMS-7881:pvr1.0:rvnMSI:rnX99SXPOWERAC(MS-7881):rvr1.0:cvnMSI:ct3:cvr1.0:
  dmi.product.name: MS-7881
  dmi.product.version: 1.0
  dmi.sys.vendor: MSI
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  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.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  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: Thu Jan  7 13:11:54 2016
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        Logitech USB Optical Mouse MOUSE, id 8
   input        AT Translated Set 2 keyboard KEYBOARD, id 9
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.17.2-1ubuntu9.1

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