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[Plamen <plamen.shkodrov@xxxxxxxxx>]

** Changed in: linux (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1510821

Title:
  Ubuntu Freezes With No Obvious Reason

Status in linux package in Ubuntu:
  Fix Released

Bug description:
  I am dev and I know how this sounds but at a certain periods ubuntu
  freezes entirely. The only exit is the power button. I dont know what
  could be helpful information in this case so I will write everything I
  noticed so far (sry for the spam).

  This used to happen a lot while building with Android Studio but
  lately it freezes even when the studio is closed. The last time it
  happened after I closed(or tried to) Chrome tab while updating ubuntu.
  This behavior started a few weeks ago. I haven't updated to 15.10 at
  the time so I did. But it still continued to block. I thought it might
  be from the video driver so I switched from nvidia-340 to nouveau with
  no success.

  I cant find anything helpful in kern.log if its needed I can attach
  the log just before the freeze. What I find strange is in the syslog.
  At the time of the freeze it is filled with NULs. See attached image
  syslog.png. The time of the freeze was around 8:57. At this point the
  mouse cursor was active but there was nothing that reacted to my
  desperate clicks or keyboard shortcuts. After awhile the mouse stops
  as well and there is nothing I can do but the power button.

  Is there some other log that could be helpful or anything else I can
  do?

  
  Thank you in advance

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Wed Oct 28 09:36:12 2015
  DistUpgraded: 2015-10-27 13:34:15,610 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   vboxhost, 5.0.2, 3.19.0-31-generic, x86_64: installed
   vboxhost, 5.0.2, 4.2.0-16-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation G92 [GeForce GTS 250] [10de:0615] (rev a2) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:82e6]
  InstallationDate: Installed on 2015-06-17 (132 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: System manufacturer System Product Name
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=db78bb87-80bc-4175-935a-18f69d5c471d ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-10-27 (0 days ago)
  dmi.bios.date: 05/13/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0401
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: M4A78-AM
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0401:bd05/13/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A78-AM:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
  version.compiz: compiz N/A
  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.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  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: Wed Oct 28 10:00:45 2015
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input         USB OPTICAL MOUSE   MOUSE, id 8
   input        AT Translated Set 2 keyboard KEYBOARD, id 9
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(0): [COPY] failed to allocate class.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9
  xserver.video_driver: nouveau

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