Thank you for taking the time to report this bug and helping to make
Ubuntu better. It sounds like some part of the system has crashed. To
help us find the cause of the crash please follow these steps:

1. Look in /var/crash for crash files and if found run:
    ubuntu-bug YOURFILE.crash
Then tell us the ID of the newly-created bug.

2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where
ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine.
Do you find any links to recent problems on that page? If so then please
send the links to us.

3. If step 2 also failed then apply the workaround from bug 994921,
reboot, reproduce the crash, and retry step 1.

Please take care to avoid attaching .crash files to bugs as we are
unable to process them as file attachments. It would also be a security
risk for yourself.

** Package changed: xorg (Ubuntu) => gdm3 (Ubuntu)

** Changed in: gdm3 (Ubuntu)
       Status: New => Incomplete

-- 
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/1790870

Title:
  No X display - gdm3 crash with segfault

Status in gdm3 package in Ubuntu:
  Incomplete

Bug description:
  This desktop was running 16.04.5 version and started few weeks ago to
  have the desktop crashing. In dmesg I saw compiz segfault at 0 ip
  [...] error 4. I decide to upgrade to 18.04.1 to solve this problem
  but it's still there: gnome-shell at 0 ip [...] error 4

  In 18.04 i even don't get the desktop, only the mouse indicator is
  visible, disappearing from time to time (seems on each crash).

  Attached is the output of an radeontool dump. The desktop is unusable
  in graphic mode.

  Daniel

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: xorg 1:7.7+19ubuntu7.1
  ProcVersionSignature: Ubuntu 4.15.0-34.37-generic 4.15.18
  Uname: Linux 4.15.0-34-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.3
  Architecture: amd64
  Date: Wed Sep  5 14:40:14 2018
  DistUpgraded: 2018-09-05 13:03:08,966 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
  DistroCodename: bionic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] RS482/RS485 [Radeon Xpress 1100/1150] 
[1002:5974] (prog-if 00 [VGA controller])
     Subsystem: Hewlett-Packard Company DC5750 Microtower [103c:280a]
     Subsystem: Hewlett-Packard Company RS480 [Radeon Xpress 1150] (Secondary) 
[103c:280b]
  InstallationDate: Installed on 2016-03-03 (916 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160227)
  MachineType: Hewlett-Packard HP Compaq dc5750 Small Form Factor
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-34-generic 
root=UUID=8c2df27f-cbc4-4c8d-a4f1-dc7994b41016 ro
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: Upgraded to bionic on 2018-09-05 (0 days ago)
  dmi.bios.date: 04/18/2007
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 786E3 v02.22
  dmi.board.name: 0A64h
  dmi.board.vendor: Hewlett-Packard
  dmi.chassis.asset.tag: CZC8312220
  dmi.chassis.type: 4
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr786E3v02.22:bd04/18/2007:svnHewlett-Packard:pnHPCompaqdc5750SmallFormFactor:pvr:rvnHewlett-Packard:rn0A64h:rvr:cvnHewlett-Packard:ct4:cvr:
  dmi.product.family: 103C_53307F
  dmi.product.name: HP Compaq dc5750 Small Form Factor
  dmi.sys.vendor: Hewlett-Packard
  version.compiz: compiz 1:0.9.13.1+18.04.20180302-0ubuntu1
  version.libdrm2: libdrm2 2.4.91-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.5-0ubuntu0~18.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.5-0ubuntu0~18.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:18.0.1-1
  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
  xserver.bootTime: Wed Sep  5 08:36:00 2018
  xserver.configfile: default
  xserver.devices:
   input        Power Button         KEYBOARD, id 6
   input        Power Button         KEYBOARD, id 7
   input        AT Translated Set 2 keyboard KEYBOARD, id 8
   input        ImPS/2 Generic Wheel Mouse MOUSE, id 9
   input        HP WMI hotkeys       KEYBOARD, id 10
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.18.4-0ubuntu0.8
  xserver.video_driver: radeon

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