** Description changed:

- The problem is that my GUI stops responding after launching a few
- applications, and is correlated to high CPU utilization of xorg.
+ The problem is that after launching a few applications, the GUI may
+ become unresponsive, although this is not consistently reproducible.
+ When the GUI is unresponsive, it is correlated to high CPU utilization
+ of xorg.
  
- An example reproduction scenario:
- launched startx,
- launched an xterm via twm,
- launched another xterm via the first,
- launched tmux,
- launched firefox-esr, bluetooth-manager, and pavucontrol,
- maximized the xterm running tmux
+ An example reproduction scenario is launch the following in order, and 
quickly:
+ startx
+ xterm via twm
+ another xterm via the first xterm
+ tmux
+ firefox-esr
+ bluetooth-manager
+ pavucontrol
  
- xorg stopped responding, ctl-alt-Fn don't respond either
+ While the above are launching, maximize the xterm running tmux, and the
+ GUI immediately becomes unresponsive. For example, Ctrl+Alt+Fn don't
+ respond.
  
- logged in via ssh, attached to tmux, launched htop, copied htop output,
- in which you can see xorg consuming lots of cpu.
+ After this, I logged in via ssh, attached to tmux, launched htop, copied
+ htop output, which shows xorg at 94.6 CPU%.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xserver-xorg 1:7.7+19ubuntu4
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  BootLog:
   Skipping profile in /etc/apparmor.d/disable: usr.sbin.rsyslogd
    * Starting AppArmor profiles       
  [ OK ]
    * Restoring resolver state...       
  [ OK ]
  CompositorRunning: None
  Date: Tue Mar 20 17:15:16 2018
  DistUpgraded: Fresh install
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   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]
  JournalErrors:
   -- Logs begin at Fri 2018-02-23 08:59:47 CST, end at Tue 2018-03-20 17:14:39 
CDT. --
   Mar 20 17:01:37 hostname pulseaudio[1099]: [pulseaudio] module-alsa-card.c: 
Failed to find a working profile.
   Mar 20 17:01:37 hostname pulseaudio[1099]: [pulseaudio] module.c: Failed to 
load module "module-alsa-card" (argument: "device_id="0" 
name="pci-0000_00_1b.0" card_name="alsa_card.pci-0000_00_1b.0" 
namereg_fail=false tsched=yes fixed_latency_range=no ignore_dB=no 
deferred_volume=yes use_ucm=yes 
card_properties="module-udev-detect.discovered=1""): initialization failed.
   Mar 20 17:01:37 hostname pulseaudio[1099]: [pulseaudio] backend-ofono.c: 
Failed to register as a handsfree audio agent with ofono: 
org.freedesktop.DBus.Error.ServiceUnknown: The name org.ofono was not provided 
by any .service files
   Mar 20 17:01:37 hostname pulseaudio[1109]: [pulseaudio] pid.c: Daemon 
already running.
  MachineType: Dell Inc. OptiPlex 755
  ProcEnviron:
   LC_TIME=en_DK.utf8
   TERM=screen
   PATH=(custom, no user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz ro 
root=UUID=22e7c84a-a416-43e9-ae9d-ee0119fc3894 panic=30
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/30/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0PU052
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 15
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvrA10:bd04/30/2008:svnDellInc.:pnOptiPlex755:pvr:rvnDellInc.:rn0PU052:rvr:cvnDellInc.:ct15:cvr:
  dmi.product.name: OptiPlex 755
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.90-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.3.3-0ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.3.3-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

** Summary changed:

- [Dell OptiPlex 755] xorg hangs
+ [Dell OptiPlex 755] Intermittently GUI hangs with high xorg CPU% after 
launching applications

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https://bugs.launchpad.net/bugs/1757299

Title:
  [Dell OptiPlex 755] Intermittently GUI hangs with high xorg CPU% after
  launching applications

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