Xorg crashed with SIGABRT in OsAbort()

[DocWilco]

Sorry, I have no further info.

ProblemType: Crash
DistroRelease: Ubuntu 16.04
Package: xserver-xorg-core 2:1.18.1-1ubuntu4
ProcVersionSignature: Ubuntu 4.4.0-15.31-generic 4.4.6
Uname: Linux 4.4.0-15-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Mon Mar 28 16:47:55 2016
DistUpgraded: 2016-02-26 13:01:01,567 DEBUG enabling apt cron job
DistroCodename: xenial
DistroVariant: ubuntu
ExecutablePath: /usr/lib/xorg/Xorg
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. 3rd Gen Core processor Graphics Controller [1043:15a7]
 NVIDIA Corporation GK107M [GeForce GT 650M] [10de:0fd1] (rev ff) (prog-if ff)
InstallationDate: Installed on 2012-12-20 (1194 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: ASUSTeK COMPUTER INC. UX51VZA
ProcCmdline: /usr/lib/xorg/Xorg -core :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
ProcEnviron:

ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-15-generic root=/dev/mapper/ubuntu-root ro pcie_aspm=force drm.vblankoffdelay=1 i915.semaphores=1 nmi_watchdog=0 "acpi_osi=!Windows 2012"
Signal: 6
SourcePackage: xorg-server
StacktraceTop:
 OsAbort ()
 ?? ()
 FatalError ()
 InitOutput ()
 ?? ()
Title: Xorg crashed with SIGABRT in OsAbort()
UpgradeStatus: Upgraded to xenial on 2016-02-26 (31 days ago)
UserGroups:

dmi.bios.date: 12/03/2012
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: UX51VZA.204
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: UX51VZA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX51VZA.204:bd12/03/2012:svnASUSTeKCOMPUTERINC.:pnUX51VZA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX51VZA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.name: UX51VZA
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
version.compiz: compiz 1:0.9.12.2+16.04.20160318-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.67-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.18.1-1ubuntu4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu3
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
xserver.bootTime: Mon Mar 28 16:50:07 2016
xserver.configfile: default
xserver.errors: modeset(G0): glamor initialization failed
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id 53349
 vendor DEL
xserver.version: 2:1.18.1-1ubuntu4

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1556418, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.