[Nouveau] [Bug 67315] New: System lockup with X consuming all CPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67315

          Priority: medium
            Bug ID: 67315
          Assignee: nouveau at lists.freedesktop.org
           Summary: System lockup with X consuming all CPU
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: ricks at alldigital.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 83002
  --> https://bugs.freedesktop.org/attachment.cgi?id=83002&action=edit
Xorg.0.log with modeset enabled and output of dmesg while problem is active

When using nouveau with modeset, the system starts up fine but eventually
(possibly when the screen saver kicks in), X consumes all CPU resources on one
core rendering the machine useless except via ssh sessions. If I disable
modeset at boot time (nouveau.modeset=0), then the system is stable but the
drive does not accept the EDID from the monitor and I'm stuck with a 1024x768
display instead of the 1600x900 it has with modeset enabled.

I'm attaching the Xorg.0.log file along with an excerpt from the output of
dmesg when this behavior is occurring.

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