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[Launchpad Bug Tracker <1519279@xxxxxxxxxxxxxxxxxx>]

Status changed to 'Confirmed' because the bug affects multiple users.

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

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https://bugs.launchpad.net/bugs/1519279

Title:
  Xorg segfault on external display plug/unplug

Status in xorg package in Ubuntu:
  Confirmed

Bug description:
  Lenovo Thinkpad E540, Ubuntu 15.10, xorg 1:7.7+7ubuntu4, driver NVIDIA
  352.63 (also reproduces with NVIDIA 340.96 and nouveau)

  When I plug/unplug external display (VGA or HDMI), X server crashes
  with the following backtrace:

  [ 115.212] (II) XKB: reuse xkmfile /var/lib/xkb/server-B20D7FC79C7F597315E3E501AEF10E0D866E8E92.xkm
  [ 116.571] (EE)
  [ 116.571] (EE) Backtrace:
  [ 116.571] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x564e760ab68e]
  [ 116.571] (EE) 1: /usr/bin/X (0x564e75ef7000+0x1b89f9) [0x564e760af9f9]
  [ 116.571] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7f1d7f12b000+0x352f0) [0x7f1d7f1602f0]
  [ 116.571] (EE) 3: /usr/bin/X (DamageRegister+0x11) [0x564e760323e1]
  [ 116.571] (EE) 4: /usr/bin/X (0x564e75ef7000+0xd9b08) [0x564e75fd0b08]
  [ 116.571] (EE) 5: /usr/bin/X (BlockHandler+0x8a) [0x564e75f53cca]
  [ 116.572] (EE) 6: /usr/bin/X (WaitForSomething+0x163) [0x564e760a83f3]
  [ 116.572] (EE) 7: /usr/bin/X (0x564e75ef7000+0x57fa1) [0x564e75f4efa1]
  [ 116.572] (EE) 8: /usr/bin/X (0x564e75ef7000+0x5c34b) [0x564e75f5334b]
  [ 116.572] (EE) 9: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7f1d7f14ba40]
  [ 116.572] (EE) 10: /usr/bin/X (_start+0x29) [0x564e75f3d6c9]
  [ 116.572] (EE)
  [ 116.572] (EE) Segmentation fault at address 0x10
  [ 116.572] (EE)
  Fatal server error:
  [ 116.572] (EE) Caught signal 11 (Segmentation fault). Server aborting

  Expected - not to crash.

  The problem occurred after update from 15.04 to 15.10. See
  XorgLogOld.txt

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  352.63  Sat Nov  7 21:25:42 PST 2015
   GCC version:  gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu2)
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  BootLog:
   fsck from util-linux 2.26.2
   /dev/sdb2: clean, 370326/2040000 files, 4422836/8191744 blocks
  Date: Tue Nov 24 11:38:52 2015
  DistUpgraded: 2015-11-06 11:48:36,801 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 4.2.0-18-generic, x86_64: installed
   bbswitch, 0.7, 4.2.0-19-generic, x86_64: installed
   nvidia-352, 352.63, 4.2.0-19-generic, x86_64: installed
   vboxhost, 5.0.2, 4.2.0-18-generic, x86_64: installed
   vboxhost, 5.0.2, 4.2.0-19-generic, x86_64: installed
  EcryptfsInUse: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:5040]
     Subsystem: Lenovo Device [17aa:5040]
  InstallationDate: Installed on 2015-08-21 (95 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 20C6A0DS00
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic.efi.signed root=UUID=9c7fde50-44fd-4663-900c-1446724ffc68 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 2015-11-06 (17 days ago)
  dmi.bios.date: 07/29/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: J9ET9AWW (2.20 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20C6A0DS00
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrJ9ET9AWW(2.20):bd07/29/2015:svnLENOVO:pn20C6A0DS00:pvrThinkPadEdgeE540:rvnLENOVO:rn20C6A0DS00:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20C6A0DS00
  dmi.product.version: ThinkPad Edge E540
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  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.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  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: Tue Nov 24 11:28:08 2015
  xserver.configfile: /etc/X11/xorg.conf
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9.1

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