** Description changed:

  My desktop session crashes sporadically. Often this happens when I leave
  the computer and the screensaver starts (Euphoria GL screensaver). This
  bug is not reproducible on demand.
  
  Attached is my Xorg log file which seems to indicate that this problem
  is related to the i915 driver code.
  
- If any additional information is needed I'm happy to provide it.
- 
- ProblemType: Bug
- DistroRelease: Ubuntu 14.04
- Package: xorg 1:7.7+1ubuntu8.1
- ProcVersionSignature: Ubuntu 4.4.0-28.47~14.04.1-generic 4.4.13
- Uname: Linux 4.4.0-28-generic x86_64
- ApportVersion: 2.14.1-0ubuntu3.21
- Architecture: amd64
- CurrentDesktop: KDE
- Date: Mon Jul  4 17:17:34 2016
- EcryptfsInUse: Yes
- InstallationDate: Installed on 2016-05-26 (38 days ago)
- InstallationMedia: Kubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 
(20160217.1)
- SourcePackage: xorg
- UpgradeStatus: Upgraded to trusty on 2016-06-15 (19 days ago)
- --- 
+ ---
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: kwin
  DistUpgraded: 2016-06-15 15:16:54,383 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroRelease: Ubuntu 14.04
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: No
  GraphicsCard:
-  Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
-    Subsystem: Lenovo Device [17aa:5036]
+  Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
+    Subsystem: Lenovo Device [17aa:5036]
  InstallationDate: Installed on 2016-05-26 (59 days ago)
  InstallationMedia: Kubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 
(20160217.1)
  LightdmGreeterLog:
-  QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such 
file or directory
-  QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
-  Bus::open: Can not get ibus-daemon's address. 
-  IBusInputContext::createInputContext: no connection to ibus-daemon 
-  file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: 
Unable to assign [undefined] to QString usersession
+  QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such 
file or directory
+  QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
+  Bus::open: Can not get ibus-daemon's address.
+  IBusInputContext::createInputContext: no connection to ibus-daemon
+  file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: 
Unable to assign [undefined] to QString usersession
  LightdmGreeterLogOld:
-  QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such 
file or directory
-  QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
-  Bus::open: Can not get ibus-daemon's address. 
-  IBusInputContext::createInputContext: no connection to ibus-daemon 
-  file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: 
Unable to assign [undefined] to QString usersession
+  QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such 
file or directory
+  QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
+  Bus::open: Can not get ibus-daemon's address.
+  IBusInputContext::createInputContext: no connection to ibus-daemon
+  file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: 
Unable to assign [undefined] to QString usersession
  MachineType: LENOVO 20BWS18900
  Package: xorg 1:7.7+1ubuntu8.1
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.6.3-040603-generic 
root=UUID=285091fd-ac1a-4801-8055-c356ab9083a5 ro quiet splash vt.handoff=7
  Tags:  trusty ubuntu
  Uname: Linux 4.6.3-040603-generic x86_64
  UpgradeStatus: Upgraded to trusty on 2016-06-15 (39 days ago)
  UserGroups:
-  
+ 
  _MarkForUpload: True
  dmi.bios.date: 03/02/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET46WW (1.11 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BWS18900
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrJBET46WW(1.11):bd03/02/2015:svnLENOVO:pn20BWS18900:pvrThinkPadT450s:rvnLENOVO:rn20BWS18900:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BWS18900
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1~ubuntu14.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri N/A
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
  xserver.bootTime: Mon Jul 25 09:49:33 2016
  xserver.configfile: default
  xserver.errors:
-  
+ 
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
-  product id                                1133 
-  vendor                                     LGD
+  product id                                1133
+  vendor                                     LGD
  xserver.version: 2:1.17.2-1ubuntu9.1~trusty1
- --- 
- ApportVersion: 2.14.1-0ubuntu3.21
- Architecture: amd64
- CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
- CompositorRunning: kwin
- CurrentDesktop: KDE
- DistUpgraded: 2016-06-15 15:16:54,383 DEBUG enabling apt cron job
- DistroCodename: trusty
- DistroRelease: Ubuntu 14.04
- DistroVariant: kubuntu
- EcryptfsInUse: Yes
- ExtraDebuggingInterest: No
- GraphicsCard:
-  Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) 
(prog-if 00 [VGA controller])
-    Subsystem: Lenovo Device [17aa:5036]
- InstallationDate: Installed on 2016-05-26 (59 days ago)
- InstallationMedia: Kubuntu 14.04.4 LTS "Trusty Tahr" - Release amd64 
(20160217.1)
- LightdmGreeterLog:
-  QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such 
file or directory
-  QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
-  Bus::open: Can not get ibus-daemon's address. 
-  IBusInputContext::createInputContext: no connection to ibus-daemon 
-  file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: 
Unable to assign [undefined] to QString usersession
- LightdmGreeterLogOld:
-  QInotifyFileSystemWatcherEngine::addPaths: inotify_add_watch failed: No such 
file or directory
-  QFileSystemWatcher: failed to add paths: /var/lib/lightdm/.config/ibus/bus
-  Bus::open: Can not get ibus-daemon's address. 
-  IBusInputContext::createInputContext: no connection to ibus-daemon 
-  file:///usr/share/kde4/apps/lightdm-kde-greeter/themes/userbar/main.qml:135: 
Unable to assign [undefined] to QString usersession
- MachineType: LENOVO 20BWS18900
- Package: xorg 1:7.7+1ubuntu8.1
- PackageArchitecture: amd64
- ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.6.3-040603-generic 
root=UUID=285091fd-ac1a-4801-8055-c356ab9083a5 ro quiet splash vt.handoff=7
- Tags:  trusty kubuntu
- Uname: Linux 4.6.3-040603-generic x86_64
- UpgradeStatus: Upgraded to trusty on 2016-06-15 (39 days ago)
- UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
- _MarkForUpload: True
- dmi.bios.date: 03/02/2015
- dmi.bios.vendor: LENOVO
- dmi.bios.version: JBET46WW (1.11 )
- dmi.board.asset.tag: Not Available
- dmi.board.name: 20BWS18900
- dmi.board.vendor: LENOVO
- dmi.board.version: SDK0E50510 WIN
- dmi.chassis.asset.tag: No Asset Information
- dmi.chassis.type: 10
- dmi.chassis.vendor: LENOVO
- dmi.chassis.version: None
- dmi.modalias: 
dmi:bvnLENOVO:bvrJBET46WW(1.11):bd03/02/2015:svnLENOVO:pn20BWS18900:pvrThinkPadT450s:rvnLENOVO:rn20BWS18900:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
- dmi.product.name: 20BWS18900
- dmi.product.version: ThinkPad T450s
- dmi.sys.vendor: LENOVO
- version.compiz: compiz N/A
- version.ia32-libs: ia32-libs N/A
- version.libdrm2: libdrm2 2.4.64-1~ubuntu14.04.1
- version.libgl1-mesa-dri: libgl1-mesa-dri N/A
- version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
- version.libgl1-mesa-glx: libgl1-mesa-glx N/A
- version.xserver-xorg-core: xserver-xorg-core N/A
- version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
- version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
- version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
- version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
- xserver.bootTime: Mon Jul 25 09:49:33 2016
- xserver.configfile: default
- xserver.errors:
-  
- xserver.logfile: /var/log/Xorg.0.log
- xserver.outputs:
-  product id                                1133 
-  vendor                                     LGD
- xserver.version: 2:1.17.2-1ubuntu9.1~trusty1

** Attachment removed: "xserver.devices.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707031/+files/xserver.devices.txt

** Attachment removed: "xdpyinfo.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707030/+files/xdpyinfo.txt

** Attachment removed: "Xrandr.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707029/+files/Xrandr.txt

** Attachment removed: "XorgLogOld.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707028/+files/XorgLogOld.txt

** Attachment removed: "XorgLog.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707027/+files/XorgLog.txt

** Attachment removed: "UdevLog.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707026/+files/UdevLog.txt

** Attachment removed: "UdevDb.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707025/+files/UdevDb.txt

** Attachment removed: "ProcModules.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707024/+files/ProcModules.txt

** Attachment removed: "ProcInterrupts.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707023/+files/ProcInterrupts.txt

** Attachment removed: "ProcEnviron.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707022/+files/ProcEnviron.txt

** Attachment removed: "Lsusb.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707020/+files/Lsusb.txt

** Attachment removed: "ProcCpuinfo.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707021/+files/ProcCpuinfo.txt

** Attachment removed: "Lspci.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707019/+files/Lspci.txt

** Attachment removed: "LightdmLog.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707018/+files/LightdmLog.txt

** Attachment removed: "LightdmDisplayLog.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707017/+files/LightdmDisplayLog.txt

** Attachment removed: "DpkgLog.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707016/+files/DpkgLog.txt

** Attachment removed: "CurrentDmesg.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707014/+files/CurrentDmesg.txt

** Attachment removed: "Dependencies.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707015/+files/Dependencies.txt

** Attachment removed: "BootLog.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4707013/+files/BootLog.txt

** Attachment removed: "ProcEnviron.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4695469/+files/ProcEnviron.txt

** Attachment removed: "Dependencies.txt"
   
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1598904/+attachment/4695468/+files/Dependencies.txt

-- 
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1598904

Title:
  X server crashes sporadically with a segfault

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