This bug was fixed in the package xorg-server - 2:1.14.6-0ubuntu1

---------------
xorg-server (2:1.14.6-0ubuntu1) saucy-proposed; urgency=medium

  * New upstream release (MRE).
  * Disable support for rotations and transforms
    on gpu screens for now. (LP: #1308515)
  * Only set RR caps that are appropriate to main/gpu screen. (LP: #1277014)
  * Fix crash in RRCrtcDetachScanoutPixmap. (LP: #1280743)
 -- Maarten Lankhorst <maarten.lankho...@ubuntu.com>   Tue, 22 Apr 2014 
12:37:21 +0200

** Changed in: xorg-server (Ubuntu Saucy)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1277014

Title:
  Xorg assert failure: X: ../../dix/dispatch.c:3920: DetachUnboundGPU:
  Assertion `slave->isGPU' failed.

Status in “xorg-server” package in Ubuntu:
  Fix Released
Status in “xorg-server” source package in Saucy:
  Fix Released

Bug description:
  This error occurred when I started my notebook without connecting to
  power source. This probably happened because I'm using the beta driver
  from nvidia optimus.

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: xserver-xorg-core 2:1.15.0-1ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-7.25-generic 3.13.1
  Uname: Linux 3.13.0-7-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.13.2-0ubuntu2
  Architecture: amd64
  AssertionMessage: X: ../../dix/dispatch.c:3920: DetachUnboundGPU: Assertion 
`slave->isGPU' failed.
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Thu Feb  6 08:46:47 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  DkmsStatus:
   bbswitch, 0.7, 3.13.0-6-generic, x86_64: installed
   bbswitch, 0.7, 3.13.0-7-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-6-generic, x86_64: installed
   nvidia-331, 331.38, 3.13.0-7-generic, x86_64: installed
  ExecutablePath: /usr/bin/Xorg
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Samsung Electronics Co Ltd Device [144d:c0d1]
   NVIDIA Corporation GF108M [GeForce GT 630M] [10de:0de9] (rev ff) (prog-if ff)
  InstallationDate: Installed on 2014-01-28 (8 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140128)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 550P5C/550P7C
  ProcCmdline: /usr/bin/X -core :0 -auth /var/run/lightdm/root/:0 -nolisten tcp 
vt7 -novtswitch
  ProcEnviron:
   
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-7-generic.efi.signed 
root=UUID=a3adce6a-3b61-48e0-82d6-ac3ec5a24dcb ro quiet splash vt.handoff=7
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   __assert_fail_base (fmt=0x7f18ee23cbe0 "%s%s%s:%u: %s%sAssertion `%s' 
failed.\n%n", assertion=assertion@entry=0x7f18f075ad57 "slave->isGPU", 
file=file@entry=0x7f18f075ad22 "../../dix/dispatch.c", line=line@entry=3920, 
function=function@entry=0x7f18f075ade0 "DetachUnboundGPU") at assert.c:92
   __GI___assert_fail (assertion=0x7f18f075ad57 "slave->isGPU", 
file=0x7f18f075ad22 "../../dix/dispatch.c", line=3920, function=0x7f18f075ade0 
"DetachUnboundGPU") at assert.c:101
   DetachUnboundGPU ()
   ?? ()
   ProcRRSetProviderOutputSource ()
  Title: Xorg assert failure: X: ../../dix/dispatch.c:3920: DetachUnboundGPU: 
Assertion `slave->isGPU' failed.
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  dmi.bios.date: 09/17/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P05ABI.016.130917.dg
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: SAMSUNG_NP1234567890
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: SEC_SW_REVISION_1234567890ABCD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP05ABI.016.130917.dg:bd09/17/2013:svnSAMSUNGELECTRONICSCO.,LTD.:pn550P5C/550P7C:pvrP05ABI:rvnSAMSUNGELECTRONICSCO.,LTD.:rnSAMSUNG_NP1234567890:rvrSEC_SW_REVISION_1234567890ABCD:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvrN/A:
  dmi.product.name: 550P5C/550P7C
  dmi.product.version: P05ABI
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.
  version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu4
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.909-0ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10-1ubuntu2
  xserver.bootTime: Thu Feb  6 08:49:54 2014
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   [drm] KMS not enabled
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               12874 
   vendor                                     SEC
  xserver.version: 2:1.15.0-1ubuntu1

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