Nouveau - Nov 2012 - [Bug 56692] New: Xorg freezes with vblank enabled on nouveau nvc8

https://bugs.freedesktop.org/show_bug.cgi?id=56692

          Priority: medium
            Bug ID: 56692
          Assignee: nouveau at lists.freedesktop.org
           Summary: Xorg freezes with vblank enabled on nouveau nvc8
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: kel.p.doran at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/nouveau
           Product: xorg

Created attachment 69458
  --> https://bugs.freedesktop.org/attachment.cgi?id=69458&action=edit
Kernel log

I am using the latest nouveau git kernel sources on top of 3.7.0-rc3,
xf86-video-nouveau 1.0.3, mesa 9.0, and xorg-server 1.13.0 and a gtx580.  The
main issue is that X freezes when the GLXVBlank option is enabled.

The screen freezes up seemingly when any OpenGL stuff gets rendered.  Even
running glxinfo can freeze it up, but just starting a basic twm session or i3wm
will not freeze it.  Attempting to play movies via xvmc also freezes it, so I
guess it it not purely OpenGL related.  It runs fine when vblank is disabled
doing the previously mentioned things.  I tried using proprietary firmware as
suggested in IRC but that did not help.

As for the freeze: the mouse starts slowing down and then freezes, and then it
can be moved again but X is completely frozen.  I can switch to a different tty
without using SysRq+R.  The tty only appears in a small box in the upper left
hand corner and the rest of the screen is what it was when X froze.  The tty is
all corrupted too... but you can see text changes when you type, and I can copy
logs and reboot so the system is still mostly working, the graphics are just
completely messed up.

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--- Comment #1 from Kelly Doran <kel.p.doran at gmail.com> ---
Created attachment 69459
  --> https://bugs.freedesktop.org/attachment.cgi?id=69459&action=edit
Xorg log

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--- Comment #2 from Kelly Doran <kel.p.doran at gmail.com> ---
Created attachment 69478
  --> https://bugs.freedesktop.org/attachment.cgi?id=69478&action=edit
Xorg log

Okay if I run X from the terminal and switch over and Ctrl+C it after the
freeze some errors, show up, but not sure if they are useful or not.

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--- Comment #3 from Kelly Doran <kel.p.doran at gmail.com> ---
Created attachment 69479
  --> https://bugs.freedesktop.org/attachment.cgi?id=69479&action=edit
Kernel log before freeze

I also increased the nouveau debug info level and captured the dmesg before and
after the freeze.

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--- Comment #4 from Kelly Doran <kel.p.doran at gmail.com> ---
Created attachment 69481
  --> https://bugs.freedesktop.org/attachment.cgi?id=69481&action=edit
Kernel log after freeze

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--- Comment #5 from Kelly Doran <kel.p.doran at gmail.com> ---
Well someone on IRC suggested there was an issue with the nv50_disp_intr_vblank
function, so I replaced the contents of it with the nvd0_disp_intr_vblank
function and it fixed the freeze!  Perhaps nvc8 cards should just use the nvd0
disp class instead?  Anyway I'll leave it to you guys to come up with an
elegant solution, hopefully this helped.

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--- Comment #6 from m.b.lankhorst at gmail.com ---
Wow, good catch!

My original patch for nvc0 used 0x1718 as well. I'll submit a patch for it.

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--- Comment #7 from Martin Peres <martin.peres at ensi-bourges.fr> ---
@Maarten: Has the patch been mainlined or not yet?

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Kelly Doran <kel.p.doran at gmail.com> changed:

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

--- Comment #8 from Kelly Doran <kel.p.doran at gmail.com> ---
This fix hit the kernel a while back.

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