Nouveau - Dec 2014 - [Bug 87179] New: [NVE7] Oops while reenabling Optimus dedicated card

https://bugs.freedesktop.org/show_bug.cgi?id=87179

            Bug ID: 87179
           Summary: [NVE7] Oops while reenabling Optimus dedicated card
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau at lists.freedesktop.org
          Reporter: tobias.klausmann at mni.thm.de
        QA Contact: xorg-team at lists.x.org

Created attachment 110662
  --> https://bugs.freedesktop.org/attachment.cgi?id=110662&action=edit
kernel 3.18 oops

Sometimes while waking the dedicated card, the system oopses and gets
unresponsive (sometimes this hangs the entire graphics system). 
Steam triggers this very easily somehow...

These hangs plague me for a while now, but this is the first hang i could
capture in a whole!

Kernel: 3.18.0, occurred with kernels at least down to 3.16

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--- Comment #1 from Tobias Klausmann <tobias.klausmann at mni.thm.de> ---
Created attachment 110663
  --> https://bugs.freedesktop.org/attachment.cgi?id=110663&action=edit
kernel 3.17 oops

I found an additional oops with 3.17 "yay"

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Tobias Klausmann <tobias.klausmann at mni.thm.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[NVE7] Oops while           |[NVE7] Warning while
                   |reenabling Optimus          |reenabling Optimus
                   |dedicated card              |dedicated card

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--- Comment #2 from Ben Skeggs <skeggsb at gmail.com> ---
Created attachment 110702
  --> https://bugs.freedesktop.org/attachment.cgi?id=110702&action=edit
possible fix

Is this issue creproducible for you?  If so, please give the attached patch a
try and see if it helps!

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--- Comment #3 from Tobias Klausmann <tobias.klausmann at mni.thm.de> ---
Created attachment 110703
  --> https://bugs.freedesktop.org/attachment.cgi?id=110703&action=edit
nouveau errors with "110702: possible fix"

While running with the above patch, several (40+) suspend/resume cycles worked
fine. The initial Warning does not seem to get triggered anymore.

Later on the machine hung while resuming, but recovered from the hang. The
attached log is from that timeframe. ~2 min later X was hanging, not
recovering. Could ssh in, nothing in dmesg.

I'm not sure if this is still the same bug or if i should open yet another
one.

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Tobias, does this still happen with recent kernels?

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Tobias Klausmann <tobias.klausmann at mni.thm.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #5 from Tobias Klausmann <tobias.klausmann at mni.thm.de> ---
Haven't seen that one in a while now, i guess we can safely close this now!

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