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[Ryan Tandy <1181902@xxxxxxxxxxxxxxxxxx>]

"nouveau.config=NvMSI=0" does seem to work around the problem. A patch
to disable MSI on these chips was linked in the upstream bug report:

https://bugs.freedesktop.org/show_bug.cgi?id=87361
http://lists.freedesktop.org/archives/nouveau/2014-December/019417.html

dmesg still mentions "MMIO write FAULT" multiple times, but that's
probably a separate bug; at least it hasn't frozen or scrambled yet.

If I should open a separate report, or provide any additional
information, just let me know what you need.

** Bug watch added: freedesktop.org Bugzilla #87361
   https://bugs.freedesktop.org/show_bug.cgi?id=87361

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https://bugs.launchpad.net/bugs/1181902

Title:
  Nouveau driver glitch on Ubuntu 13.04 will cause system to freeze
  under certain conditions

Status in xserver-xorg-video-nouveau package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  This only happens to Ubuntu 13.04, as my GeForce 6150SE card was
  working fine for Ubuntu 12.10. The Nouveau driver glitch will cause my
  whole system to freeze under certain conditions.

  I first get my system freeze when starting virtualbox, which is
  installed from the offical Oracle virtualbox PPA. Duplicated several
  times -- Freshly boot into X, then start virtualbox from within xterm
  via "virtualbox &", 2 seconds later my whole system freeze up.

  Google search indicated that it might be cause by the offical Oracle
  virtualbox PPA, so I followed the advice to switch to the offical
  Ubuntu virtualbox from the software center, but get into system freeze
  doing exactly the same thing. Duplicated several times as well.

  I was about to conclude that it is the virtualbox's problem when I
  suddenly remember that I've got into such system freeze before doing
  something entirely different, because the symptom is exactly the same.
  So I tried again -- "startx -- :1" to get me into another X session,
  and quit.

  Yes, then and there, I get into such system freeze again. The symptom
  is that the display turned black, then a random pattern tiled across
  the whole screen.

  Installing the closed source additional driver (nvidia) to replace the
  Nouveau driver solve the problem, which in turn proved that my
  suspicion was right -- it *is* the Nouveau driver that is causing the
  problem.

  Thanks

  PS.

  Comparing with the previous Xorg.1.log, the lines that didn't get
  output are:

   (II) NOUVEAU(0): EDID vendor "ACR", prod id 426
   (II) NOUVEAU(0): Using EDID range info for horizontal sync
   (II) NOUVEAU(0): Using EDID range info for vertical refresh
   (II) NOUVEAU(0): Printing DDC gathered Modelines:
   . . . 

  The whole unloading part (filtered by "sed 's/\[[^]]*]//'") of my
  previous Xorg.1.log is at http://paste.debian.net/5260/, the whole un-
  filtered file is at http://paste.debian.net/5261/.

  Here is my GeForce 6150SE card:

  $ lspci | grep VGA
  00:0d.0 VGA compatible controller: NVIDIA Corporation C61 [GeForce 6150SE nForce 430] (rev a2)

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