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[Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>]

(In reply to comment #107)
> So, i tasted with latest git 3.10.0-rc7-00854-gf19c9d3 - same result.
> 
> (gdb) l *intel_crtc_set_config+0x216
> 0x2bab0 is in intel_crtc_set_config
> (/home/lex/tmp/linux/drivers/gpu/drm/i915/intel_display.c:8678).
> 8673			      int num_connectors)
> 8674	{
> 8675		int i;
> 8676	
> 8677		for (i = 0; i < num_connectors; i++)
> 8678			if (connectors[i].encoder &&
> 8679			    connectors[i].encoder->crtc == crtc &&
> 8680			    connectors[i].dpms != DRM_MODE_DPMS_ON)
> 8681				return true;
> 8682	
> 
> 
> I noticed that in some circumstances i null pointer dereference on xhci
> driver. Interesting, are these errors connected? Or may be there is some
> memory region used by what ever, bios, efi?

This OOPS is fixed by

commit 2e57f47d317dd035b18634b0c602272529368fcc
Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Date:   Wed Jul 17 12:14:40 2013 +0100

    drm/i915: Fix dereferencing invalid connectors in is_crtc_connector_off()
    
    In commit e3de42b68478a8c95dd27520e9adead2af9477a5
    Author: Imre Deak <imre.deak@xxxxxxxxx>
    Date:   Fri May 3 19:44:07 2013 +0200
    
        drm/i915: force full modeset if the connector is in DPMS OFF mode

No idea why VT-d affects that at all.

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https://bugs.launchpad.net/bugs/946311

Title:
  only external screen is working with asus zenbook ux31e [eDP1]

Status in X.org xf86-video-intel:
  Incomplete
Status in “linux” package in Ubuntu:
  Fix Released
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Fix Released

Bug description:
  This is regression after some recent (2-3 weeks) xorg? update.

  I also tested newest kernel v3.3.0-rc6 with no changes, so we can
  exclude kernel.

  This ultrabook is intensively used. So if you need some testing, i can
  do it only on weekends.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: xorg 1:7.6+10ubuntu1
  Uname: Linux 3.3.0-rc6 x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 1.93-0ubuntu2
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,compiztoolbox,grid,gnomecompat,imgpng,mousepoll,regex,place,vpswitch,move,animation,snap,resize,session,expo,wall,ezoom,fade,workarounds,scale,unityshell]
  CompositorRunning: compiz
  Date: Sun Mar  4 13:56:04 2012
  DistUpgraded: Fresh install
  DistroCodename: precise
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1427]
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120201.1)
  MachineType: ASUSTeK Computer Inc. UX31E
  ProcEnviron:
   TERM=xterm
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.3.0-rc6 root=UUID=ab2e9ae5-a032-44f5-b956-3223de09edff ro oops=panic panic=10 quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/20/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX31E.211
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX31E
  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.:bvrUX31E.211:bd01/20/2012:svnASUSTeKComputerInc.:pnUX31E:pvr1.0:rvnASUSTeKComputerInc.:rnUX31E:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: UX31E
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu5
  version.ia32-libs: ia32-libs 20090808ubuntu33
  version.libdrm2: libdrm2 2.4.30-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.99.901+git20120126-0ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20111219.aacbd629-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20111201+b5534a1-1build2

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