Public bug reported:

Occasionally, I'm having issues with one machine where it seems that X
fails to start on boot. The actual errors from /var/log/Xorg.0.log.old:

[    11.512] drmOpenDevice: node name is /dev/dri/card0
[    11.514] drmOpenDevice: open result is 12, (OK)
[    11.514] drmOpenByBusid: Searching for BusID pci:0000:00:02.0
[    11.514] drmOpenDevice: node name is /dev/dri/card0
[    11.514] drmOpenDevice: open result is 12, (OK)
[    11.514] drmOpenByBusid: drmOpenMinor returns 12
[    11.514] drmOpenByBusid: Interface 1.4 failed, trying 1.1
[    11.514] drmOpenByBusid: drmGetBusid reports 
[    11.514] drmOpenDevice: node name is /dev/dri/card1
[    11.518] drmOpenByBusid: drmOpenMinor returns -1
[    11.518] drmOpenDevice: node name is /dev/dri/card2
[    11.522] drmOpenByBusid: drmOpenMinor returns -1
[    11.522] drmOpenDevice: node name is /dev/dri/card3
[    11.525] drmOpenByBusid: drmOpenMinor returns -1
[    11.525] drmOpenDevice: node name is /dev/dri/card4
[    11.529] drmOpenByBusid: drmOpenMinor returns -1
[    11.529] drmOpenDevice: node name is /dev/dri/card5
[    11.533] drmOpenByBusid: drmOpenMinor returns -1
[    11.533] drmOpenDevice: node name is /dev/dri/card6
[    11.536] drmOpenByBusid: drmOpenMinor returns -1
[    11.536] drmOpenDevice: node name is /dev/dri/card7
[    11.540] drmOpenByBusid: drmOpenMinor returns -1
[    11.540] drmOpenDevice: node name is /dev/dri/card8
[    11.543] drmOpenByBusid: drmOpenMinor returns -1
[    11.543] drmOpenDevice: node name is /dev/dri/card9
[    11.547] drmOpenByBusid: drmOpenMinor returns -1
[    11.547] drmOpenDevice: node name is /dev/dri/card10
[    11.551] drmOpenByBusid: drmOpenMinor returns -1
[    11.551] drmOpenDevice: node name is /dev/dri/card11
[    11.554] drmOpenByBusid: drmOpenMinor returns -1
[    11.554] drmOpenDevice: node name is /dev/dri/card12
[    11.558] drmOpenByBusid: drmOpenMinor returns -1
[    11.558] drmOpenDevice: node name is /dev/dri/card13
[    11.562] drmOpenByBusid: drmOpenMinor returns -1
[    11.562] drmOpenDevice: node name is /dev/dri/card14
[    11.565] drmOpenByBusid: drmOpenMinor returns -1
[    11.565] drmOpenDevice: node name is /dev/dri/card15
[    11.569] drmOpenByBusid: drmOpenMinor returns -1
[    11.569] drmOpenDevice: node name is /dev/dri/card0
[    11.569] drmOpenDevice: open result is 12, (OK)
[    11.581] drmOpenDevice: node name is /dev/dri/card0
[    11.581] drmOpenDevice: open result is 12, (OK)
[    11.581] drmGetBusid returned ''
[    11.581] (EE) intel(0): [drm] failed to set drm interface version.
[    11.581] (EE) intel(0): Failed to become DRM master.
[    11.581] (II) intel(0): Creating default Display subsection in Screen 
section
        "Default Screen Section" for depth/fbbpp 24/32
[    11.581] (==) intel(0): Depth 24, (--) framebuffer bpp 32
[    11.581] (==) intel(0): RGB weight 888
[    11.581] (==) intel(0): Default visual is TrueColor
[    11.581] (II) intel(0): Integrated Graphics Chipset: Intel(R) Sandybridge 
Desktop (GT1)
[    11.581] (--) intel(0): Chipset: "Sandybridge Desktop (GT1)"
[    11.582] (**) intel(0): Shadow buffer enabled, 2D GPU acceleration disabled.
[    11.582] (**) intel(0): Relaxed fencing disabled
[    11.582] (**) intel(0): Wait on SwapBuffers? enabled
[    11.582] (**) intel(0): Triple buffering? enabled
[    11.582] (**) intel(0): Framebuffer tiled
[    11.582] (**) intel(0): Pixmaps tiled
[    11.582] (**) intel(0): 3D buffers tiled
[    11.582] (**) intel(0): SwapBuffers wait enabled
[    11.582] (==) intel(0): video overlay key set to 0x101fe
[    11.582] (EE) intel(0): failed to get resources: Bad file descriptor
[    11.582] (II) UnloadModule: "intel"
[    11.582] (II) Unloading intel
[    11.582] (EE) Screen(s) found, but none have a usable configuration.
[    11.582] 
Fatal server error:
[    11.582] no screens found
Full log attached.

The graphics card is: 00:02.0 VGA compatible controller: Intel
Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller (rev 09)

dmesg output relating to the video card seems normal (no different from
when it works OK):

[   10.789148] [drm] Initialized drm 1.1.0 20060810
[   10.795531] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[   10.795535] i915 0000:00:02.0: setting latency timer to 64
[   10.846703] i915 0000:00:02.0: irq 47 for MSI/MSI-X
[   10.846707] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[   10.846708] [drm] Driver supports precise vblank timestamp query.
[   10.846730] vgaarb: device changed decodes: 
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[   11.362779] init: failsafe main process (818) killed by TERM signal
[   11.363016] init: alsa-restore main process (934) terminated with status 19
[   11.364523] init: apport pre-start process (930) terminated with status 1
[   11.368303] init: apport post-stop process (952) terminated with status 1
[   11.484479] fbcon: inteldrmfb (fb0) is primary device
[   11.484548] Console: switching to colour frame buffer device 240x67
[   11.484570] fb0: inteldrmfb frame buffer device
[   11.484570] drm: registered panic notifier
[   11.484579] No ACPI video bus found
[   11.484618] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0
[   11.484664] HDA Intel 0000:00:1b.0: PCI INT A -> GSI 22 (level, low) -> IRQ 
22
[   11.484765] HDA Intel 0000:00:1b.0: irq 48 for MSI/MSI-X
[   11.484791] HDA Intel 0000:00:1b.0: setting latency timer to 64

Originally reported at askubuntu.com here:
http://askubuntu.com/questions/99881/x-windows-occasionally-fails-to-
start-up as prompted by apport.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7.1
ProcVersionSignature: Ubuntu 3.0.0-15.26-generic 3.0.13
Uname: Linux 3.0.0-15-generic x86_64
.tmp.unity.support.test.0:
 
.tmp.unity.support.test.1:
 
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,mousepoll,gnomecompat,place,imgpng,vpswitch,move,grid,snap,unitymtgrabhandles,regex,resize,session,wall,animation,fade,workarounds,expo,scale,ezoom,unityshell]
CompositorRunning: None
Date: Mon Feb  6 15:33:59 2012
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.1.2, 3.0.0-14-generic, x86_64: installed
 virtualbox, 4.1.2, 3.0.0-15-generic, x86_64: installed
ExtraDebuggingInterest: Yes, whatever it takes to get this fixed in Ubuntu
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0102] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: ASRock Incorporation Device [1849:0102]
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-15-generic 
root=UUID=9b4403c1-bec3-4fbb-a9be-af476930cef7 ro quiet splash vt.handoff=7
SourcePackage: xorg
UnitySupportTest: Error: command ['/usr/lib/nux/unity_support_test', '-p', 
'-f'] failed with exit code 1: Error: OpenGL rendering is not supported by the 
root visual
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/08/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.60
dmi.board.name: H67DE3
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.60:bd07/08/2011:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH67DE3:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu6
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20110411+8378443-1

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric ubuntu

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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/927684

Title:
  X windows occasionally fails to start up

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