Public bug reported:

This is occuring when I change users, and when I log in from the login GUI, but 
not 100% of the time (!). 
It just started yesterday.

Boot brings up the graphical login screen normally. I log in with the 
primary/only user, and the screen goes very dark and I get just a mouse pointer 
which appears and moves if I use the mouse (trackpad or etc).
I don't seem to be able to get windows to work, but if I could I couldn't see 
them, since the screen stays black except for that pointer.

If I type Ctrl-Alt-F1, it takes a few seconds rather than less than 1 to
get to a TTY.  There, there is a steady but slow stream of errors coming
up that look like this:

*ERROR* render ring hung inside bo (0xxxx) at (0xxxx)
drm:i915_hangcheck_elapsed
i915_set_reset_status *ERROR* render ring hung inside bo


I can however, log in fine in TTY and access my files. It looks like nothing 
much is running (top), and I don't see the normal X processes.

This is making my computer unusable.  I'm running on the latest 13.10 on a 
Lenovo thinkpad X230tablet.
I don't think I made any changes. There was one update that occurred shortly 
before this started yesterday, but it doesn't have anything suspicious-looking 
in it.  It was:

Start-Date: 2014-01-06  15:34:15
Commandline: apt-get dist-upgrade
Upgrade: libnautilus-extension1a:amd64 (3.8.2-0ubuntu2.1, 3.8.2-0ubuntu2.2), 
libjavascriptcoregtk-3.0-0:amd64 (1.10.2-0ubuntu2, 1.10.2-0ubuntu3), libwe
bkitgtk-1.0-0:amd64 (1.10.2-0ubuntu2, 1.10.2-0ubuntu3), 
gir1.2-javascriptcoregtk-3.0:amd64 (1.10.2-0ubuntu2, 1.10.2-0ubuntu3), 
ubuntu-release-upgrader-
gtk:amd64 (0.205.2, 0.205.4), usb-creator-common:amd64 (0.2.50, 0.2.50.1), 
nautilus:amd64 (3.8.2-0ubuntu2.1, 3.8.2-0ubuntu2.2), libwebkitgtk-3.0-0:amd64 
(1.10.2-0ubuntu2, 1.10.2-0ubuntu3), nautilus-data:amd64 (3.8.2-0ubuntu2.1, 
3.8.2-0ubuntu2.2), python3-distupgrade:amd64 (0.205.2, 0.205.4), 
libwebkitgtk-3.0-common:amd64 (1.10.2-0ubuntu2, 1.10.2-0ubuntu3), 
libwebkitgtk-1.0-common:amd64 (1.10.2-0ubuntu2, 1.10.2-0ubuntu3), 
usb-creator-gtk:amd64 (0.2.50, 0.2.50.1), ubuntu-release-upgrader-core:amd64 
(0.205.2, 0.205.4), libjavascriptcoregtk-1.0-0:amd64 (1.10.2-0ubuntu2, 
1.10.2-0ubuntu3), gir1.2-webkit-3.0:amd64 (1.10.2-0ubuntu2, 1.10.2-0ubuntu3)
End-Date: 2014-01-06  15:35:01

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xorg 1:7.7+1ubuntu6
ProcVersionSignature: Ubuntu 3.11.0-15.23-generic 3.11.10
Uname: Linux 3.11.0-15-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.12.5-0ubuntu2.2
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: Tue Jan  7 09:03:14 2014
DistUpgraded: Fresh install
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 4.2.16, 3.11.0-14-generic, x86_64: installed
 virtualbox, 4.2.16, 3.11.0-15-generic, x86_64: installed
EcryptfsInUse: Yes
ExtraDebuggingInterest: Yes, if not too technical
GpuHangFrequency: Several times a day
GpuHangReproducibility: Occurs more often under certain circumstances
GpuHangStarted: Within the last few days
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 
09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:2203]
InstallationDate: Installed on 2013-12-13 (24 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: LENOVO 34372VU
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-15-generic.efi.signed 
root=UUID=33e2b43f-d28c-4bf2-ae8b-17e29f42082a ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/25/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: GCET21WW (1.10 )
dmi.board.asset.tag: Not Available
dmi.board.name: 34372VU
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvrGCET21WW(1.10):bd07/25/2012:svnLENOVO:pn34372VU:pvrThinkPadX230Tablet:rvnLENOVO:rn34372VU:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 34372VU
dmi.product.version: ThinkPad X230 Tablet
dmi.sys.vendor: LENOVO
version.compiz: compiz 1:0.9.10+13.10.20131011-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.46-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Tue Jan  7 08:26:34 2014
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                 728 
 vendor                                     LGD
xserver.version: 2:1.14.3-3ubuntu2

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


** Tags: amd64 apport-bug compiz-0.9 freeze saucy ubuntu

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https://bugs.launchpad.net/bugs/1266784

Title:
  i915_set_reset_status *ERROR* render ring hung inside bo

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