Public bug reported:

It happens quite frequently. I have just noticed that I do not have 
/var/log/messages file, but did make a picture of the screen.
Here is the link of picture: http://www.box.com/s/jo5i1jm3f9juvl5l0yuj

Graphics is sandy bridge, mainboard z68 extreme4, processor i7 2600k. I
am using PPA xorg-edgers, so sorry if this is not a valid one.

 lsmod
Module                  Size  Used by
pci_stub               12622  1 
vboxpci                23200  0 
vboxnetadp             13382  0 
vboxnetflt             23441  0 
vboxdrv               282739  3 vboxpci,vboxnetadp,vboxnetflt
parport_pc             32866  0 
ppdev                  17113  0 
microcode              22789  0 
snd_hda_codec_hdmi     32474  1 
snd_hda_codec_realtek   223860  1 
rfcomm                 47604  0 
bnep                   18281  2 
bluetooth             180104  10 rfcomm,bnep
binfmt_misc            17540  1 
usblp                  18307  0 
joydev                 17693  0 
snd_hda_intel          33773  3 
snd_hda_codec         127706  3 
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
snd_hwdep              13668  1 snd_hda_codec
snd_pcm                97188  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
hid_logitech_dj        18593  0 
mxm_wmi                12979  0 
snd_seq_midi           13324  0 
usbhid                 47199  1 hid_logitech_dj
hid                    99559  2 hid_logitech_dj,usbhid
snd_rawmidi            30748  1 snd_seq_midi
snd_seq_midi_event     14899  1 snd_seq_midi
snd_seq                61896  2 snd_seq_midi,snd_seq_midi_event
snd_timer              29990  2 snd_pcm,snd_seq
snd_seq_device         14540  3 snd_seq_midi,snd_rawmidi,snd_seq
psmouse                87603  0 
serio_raw              13211  0 
snd                    78855  16 
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
shpchp                 37277  0 
i915                  468529  3 
soundcore              15091  1 snd
snd_page_alloc         18529  2 snd_hda_intel,snd_pcm
drm_kms_helper         42489  1 i915
drm                   241873  4 i915,drm_kms_helper
i2c_algo_bit           13423  1 i915
wmi                    19256  1 mxm_wmi
mei                    41616  0 
video                  19411  1 i915
mac_hid                13253  0 
lp                     17799  0 
parport                46562  3 parport_pc,ppdev,lp
firewire_ohci          41000  0 
firewire_core          63558  1 firewire_ohci
tg3                   152032  0 
crc_itu_t              12707  1 firewire_core
floppy                 70365  0 

lspci
00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family 
DRAM Controller (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core 
Processor Family Integrated Graphics Controller (rev 09)
00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series 
Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family 
USB Enhanced Host Controller #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family 
High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 1 (rev b5)
00:1c.4 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 5 (rev b5)
00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 6 (rev b5)
00:1c.6 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 7 (rev b5)
00:1c.7 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI 
Express Root Port 8 (rev b5)
00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family 
USB Enhanced Host Controller #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation Z68 Express Chipset Family LPC Controller 
(rev 05)
00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 
SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus 
Controller (rev 05)
02:00.0 SATA controller: Marvell Technology Group Ltd. 88SE9120 SATA 6Gb/s 
Controller (rev 12)
03:00.0 USB controller: Etron Technology, Inc. EJ168 USB 3.0 Host Controller 
(rev 01)
04:00.0 USB controller: Etron Technology, Inc. EJ168 USB 3.0 Host Controller 
(rev 01)
05:00.0 PCI bridge: PLX Technology, Inc. PEX 8608 8-lane, 8-Port PCI Express 
Gen 2 (5.0 GT/s) Switch (rev ba)
06:01.0 PCI bridge: PLX Technology, Inc. PEX 8608 8-lane, 8-Port PCI Express 
Gen 2 (5.0 GT/s) Switch (rev ba)
06:04.0 PCI bridge: PLX Technology, Inc. PEX 8608 8-lane, 8-Port PCI Express 
Gen 2 (5.0 GT/s) Switch (rev ba)
06:05.0 PCI bridge: PLX Technology, Inc. PEX 8608 8-lane, 8-Port PCI Express 
Gen 2 (5.0 GT/s) Switch (rev ba)
06:06.0 PCI bridge: PLX Technology, Inc. PEX 8608 8-lane, 8-Port PCI Express 
Gen 2 (5.0 GT/s) Switch (rev ba)
06:07.0 PCI bridge: PLX Technology, Inc. PEX 8608 8-lane, 8-Port PCI Express 
Gen 2 (5.0 GT/s) Switch (rev ba)
06:08.0 PCI bridge: PLX Technology, Inc. PEX 8608 8-lane, 8-Port PCI Express 
Gen 2 (5.0 GT/s) Switch (rev ba)
06:09.0 PCI bridge: PLX Technology, Inc. PEX 8608 8-lane, 8-Port PCI Express 
Gen 2 (5.0 GT/s) Switch (rev ba)
08:00.0 PCI bridge: ASMedia Technology Inc. ASM1083/1085 PCIe to PCI Bridge 
(rev 01)
0a:00.0 FireWire (IEEE 1394): VIA Technologies, Inc. VT6315 Series Firewire 
Controller (rev 01)
0b:00.0 Ethernet controller: Broadcom Corporation NetLink BCM57781 Gigabit 
Ethernet PCIe (rev 10)

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/958546

Title:
  Kernel panic on shutdown

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