i am not asking for help.  this is a bug report.  i am reporting a bug.
if there is useful information i can gather i am happy to do so.

4) the steps in the description of this bug were performed in fairly
rapid succession, so several apps were busy starting up.  The lockup
occurred instantly after maximizing the xterm.  6) killing Xorg freed
the terminal.  3) it is not consistently reproducible.  Under xenial it
happens watching videos (Bug #1744429).  Since installing bionic, videos
haven't tripped it so far.  This bug report describes an occurrence that
didn't involve a video.

5) here is what htop looks like right after logging in, launching
startx, 2 xterms, and htop:

0  [                                     0.0%] Tasks: 37; 1 running             
         [0/0]
1  [                                     0.0%] Load average: 0.12 0.30 0.15     
             
Mem[||||||||                       122M/1.90G] Time: 15:54:56                   
             
Swp[                                 0K/1.86G]                                  
             
  PID START USER       VIRT   RES  NI CPU%   TIME+  S Command                   
             
    1 15:51 root       155M  8996   1  0.0  0:01.92 S /sbin/init                
             
  253 15:51 root      86576 18424   0  0.0  0:01.16 S 
/lib/systemd/systemd-journald          
  543 15:51 syslog     252M  4576   0  0.0  0:00.99 S /usr/sbin/rsyslogd -n     
             
  828 15:52 g          242M 23468   0  0.0  0:00.53 S /usr/lib/xorg/Xorg 
-nolisten tcp :0 vt1
  278 15:51 root      47348  5788   0  0.0  0:00.51 S 
/lib/systemd/systemd-udevd             
  549 15:51 root       280M  6952   0  0.0  0:00.12 S 
/usr/lib/accountsservice/accounts-daemon
  769 15:53 g         29276  7588   0  0.0  0:00.09 S -bash                     
             
  980 15:54 root      61440  4228   0  0.0  0:00.09 S sudo -H -uG -s            
             
  953 15:54 g         29308  7452   0  0.0  0:00.08 S -bash                     
             
  893 15:52 g         28304  6432   0  0.0  0:00.06 S bash                      
             
 1005 15:54 root      28136  6464   0  0.0  0:00.06 S /bin/bash                 
             
  550 15:51 root       417M  9020   0  0.0  0:00.05 S /usr/sbin/ModemManager    
             
  551 15:51 messagebu 50088  4664   0  0.0  0:00.05 S /usr/bin/dbus-daemon 
--system --address=
  871 15:52 g         86456 10504   0  0.0  0:00.05 S xterm                     
             
  890 15:52 g         86456 10464   0  0.0  0:00.05 S xterm -bg black -fg white 
-rightbar -xrm
  834 15:52 g         46120  5524   0  0.0  0:00.04 S x-window-manager          
             
F1Help  F2Setup F3SearchF4FilterF5Tree  F6SortByF7Nice -F8Nice +F9Kill  F10Quit

here is what htop looks like while quiescent after several hours of use:

0  [|||                                  5.3%] Tasks: 55; 1 running             
          [0/0]
1  [|||                                  4.6%] Load average: 0.00 0.04 0.07     
              
Mem[||||||||||||||||||||||||||||||1.11G/1.90G] Time: 15:22:36                   
              
Swp[                                 0K/1.86G]                                  
              
  PID START USER       VIRT   RES  NI CPU%   TIME+  S Command                   
              
 1231 07:07 g         2605M  707M   0  0.7 30:52.86 S 
/usr/lib/firefox-esr/plugin-container -gr
 1119 07:06 g         2385M  431M   0  7.3 12:13.72 S 
/usr/lib/firefox-esr/firefox-esr        
  883 07:05 g          348M 54372   0  0.0  1:39.51 S /usr/lib/xorg/Xorg 
-nolisten tcp :0 vt1 -
 1051 07:06 g         1049M 10372 -11  0.0  1:31.19 S /usr/bin/pulseaudio 
--start --log-target=
 1027 07:06 g          535M 41720   0  0.0  1:10.72 S pavucontrol               
              
 1023 07:06 g          832M 58800   0  0.0  0:10.06 S /usr/bin/python3 
/usr/bin/blueman-manager
 1058 07:06 g         70784  6520   0  0.0  0:03.05 S xclock -geometry --1+-4 
-fg green -bg bla
    1 06:51 root       155M  9016   0  0.0  0:02.93 S /sbin/init                
              
  925 07:05 g         86456 10456   0  0.0  0:02.80 S xterm                     
              
 2600 15:18 root      28044  5228   0  0.7  0:01.45 R htop                      
              
  889 07:05 g         46120  5704   0  0.0  0:01.38 S x-window-manager          
              
  253 06:52 root      86568 16580   0  0.0  0:01.13 S 
/lib/systemd/systemd-journald           
  544 06:52 syslog     252M  4508   0  0.0  0:01.06 S /usr/sbin/rsyslogd -n     
              
  280 06:52 root      47580  5940   0  0.0  0:00.55 S 
/lib/systemd/systemd-udevd              
 1070 07:06 g          648M 51880   0  0.0  0:00.43 S /usr/bin/python3 
/usr/bin/blueman-applet
  518 06:52 root       280M  7192   0  0.0  0:00.41 S 
/usr/lib/accountsservice/accounts-daemon
F1Help  F2Setup F3SearchF4FilterF5Tree  F6SortByF7Nice -F8Nice +F9Kill  F10Quit

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1757299

Title:
  [Dell OptiPlex 755] xorg hangs

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  The problem is that my GUI stops responding after launching a few
  applications, and 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

  xorg stopped responding, ctl-alt-Fn don't respond either

  logged in via ssh, attached to tmux, launched htop, copied htop
  output, in which you can see xorg consuming lots of 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

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