Thanks for looking into this issue.
I updated bios.  I upgraded the bios.  It became better.   But problem still 
exists. It does not happen frequently. It can recovery by itself after a couple 
of minutes   I doubt it is related to bios.    It became better because I 
changed the java heap size.  It is easy to reproduce when I have chrome running 
at the same time.  gui freezes when the java program starts.  After the program 
starts, the gui response is not fast.  The version of Java I am using is 
jdk1.8.0_102.   If I run the same java program on 64 bits windows 7 on the same 
machine with the same heap size setting, it runs a lot faster.

sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

P2.2007/05/2016
 

    On Wednesday, August 31, 2016 11:20 PM, Christopher M. Penalver 
<christopher.m.penal...@gmail.com> wrote:
 

 Yuan Song, thank you for reporting this and helping make Ubuntu better.

As per http://www.asrock.com/mb/Intel/H170M%20Pro4/?cat=Download&os=BIOS
an update to your computer's buggy, insecure, and outdated BIOS is
available (2.20). When you update to this following
https://help.ubuntu.com/community/BIOSUpdate how does this improve the
situation?

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Please note your current BIOS is already in the Bug Description, so
posting this on the old BIOS would not be helpful.

Also, you don't have to create a new report.

Once the BIOS is updated, if the problem is still reproducible:
1) Please provide the output of the following terminal command (not perform an 
apport-collect):
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
2) Please make a comment specifically advising on how this improves the 
situation.
3) Please mark this report Status New.

If it's not reproducible, please mark this as Invalid.

Thank you for your help.

** Tags added: bios-outdated-2.20

** Changed in: xorg (Ubuntu)
  Importance: Undecided => Low

** Changed in: xorg (Ubuntu)
      Status: New => Incomplete

-- 
You received this bug notification because you are subscribed to the bug
report.
https://bugs.launchpad.net/bugs/1611191

Title:
  Xorg freeze

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  X froze after I launched a GUI application with oracle java 8

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
  Uname: Linux 4.4.0-31-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
  NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.96  Sun Nov  8 22:33:28 
PST 2015
  GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.1)
  .tmp.unity_support_test.0:
  
  ApportVersion: 2.20.1-0ubuntu2.1
  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: Mon Aug  8 22:30:44 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes
  GraphicsCard:
  NVIDIA Corporation GT218 [GeForce 210] [10de:0a65] (rev a2) (prog-if 00 [VGA 
controller])
    Subsystem: ASUSTeK Computer Inc. GT218 [GeForce 210] [1043:848e]
  InstallationDate: Installed on 2016-05-11 (90 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  Lsusb:
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 019: ID 125f:1036 A-DATA Technology Co., Ltd. 
  Bus 001 Device 017: ID 046d:c52b Logitech, Inc. Unifying Receiver
  Bus 001 Device 028: ID 154b:0041 PNY 
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-31-generic 
root=UUID=1e3cfb77-cf43-4ab5-8797-b2c6be8c0805 ro quiet splash
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/20/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.90
  dmi.board.name: H170M Pro4
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.90:bd01/20/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH170MPro4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.
  version.compiz: compiz 1:0.9.12.2+16.04.20160526-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2.1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2.1
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.3
  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: Sun Aug  7 10:48:30 2016
  xserver.configfile: default
  xserver.errors: open /dev/fb0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
  
  xserver.version: 2:1.18.3-1ubuntu2.3

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https://bugs.launchpad.net/bugs/1611191

Title:
  Xorg freeze

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