Nouveau - Jan 2014 - [Bug 74062] New: Artifacts in 3D games.

https://bugs.freedesktop.org/show_bug.cgi?id=74062

          Priority: medium
            Bug ID: 74062
          Assignee: nouveau at lists.freedesktop.org
           Summary: Artifacts in 3D games.
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mbarrera at gmx.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 10.0
         Component: Drivers/DRI/nouveau
           Product: Mesa

Moving artifacts are present in the rendering of 3D games such as OpenArena or
Minetest/Freeminer, happens in glxgears too. However, there is no issue when I
use compiz. In blender, the artifacts are visible only ?inside? 3d elements.

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--- Comment #1 from Mario Barrera <mbarrera at gmx.com> ---
Created attachment 92790
  --> https://bugs.freedesktop.org/attachment.cgi?id=92790&action=edit
Video of a short gameplay in OpenArena where the artifacts can be seen

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--- Comment #2 from Mario Barrera <mbarrera at gmx.com> ---
Created attachment 92791
  --> https://bugs.freedesktop.org/attachment.cgi?id=92791&action=edit
Blender having artifacts visible only ?inside? 3d elements in the design view

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--- Comment #3 from Ilia Mirkin <imirkin at alum.mit.edu> ---
What hardware is this with? (dmesg | grep -i chipset). Do you see any
nouveau-related errors in dmesg?

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--- Comment #4 from Mario Barrera <mbarrera at gmx.com> ---
(In reply to comment #3)
> What hardware is this with? (dmesg | grep -i chipset). Do you see any
> nouveau-related errors in dmesg?
Hi Ilia, it is chipset GK104 (NVE4).
I don't see any nouveau related errors in dmesg, only a warning about
unknown
voltage. I am attaching the output of dmesg.

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--- Comment #5 from Mario Barrera <mbarrera at gmx.com> ---
Created attachment 92889
  --> https://bugs.freedesktop.org/attachment.cgi?id=92889&action=edit
Output of dmesg for the system with the issue.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Artifacts in 3D games.      |[NVE4] Artifacts in 3D
                   |                            |games.

--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
I think I remember someone else having this style of corruption... e.g.
https://bugs.freedesktop.org/attachment.cgi?id=87845 from bug #70326 (for nvf0,
but they're sorta similar and the reporter mentions that he saw that issue
on a
gtx650, which is nve7 probably). Sadly, not the slightest clue as to what's
wrong :( Feels like it's just not rendering certain triangles, or
doesn't have
time to do it, or we're not waiting for it properly... or something else
entirely.

I was going to recommend that you try to use blob graph fw, but I see you're
already doing that. I suppose going back to the nouveau one causes even worse
issues...

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #92790|application/octet-stream    |video/mpeg
          mime type|                            |

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--- Comment #7 from Mario Barrera <mbarrera at gmx.com> ---
(In reply to comment #6)
> I was going to recommend that you try to use blob graph fw, but I see
you're
> already doing that. I suppose going back to the nouveau one causes even
> worse issues...
Actually, the nouveau one has exactly the same issues.

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--- Comment #8 from Mario Barrera <mbarrera at gmx.com> ---
Probably useful, the artifacts are not present if the OpenGL application is run
inside a Xephyr screen, though the performance decreases.

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--- Comment #9 from Elias Vanderstuyft <Elias.vds at gmail.com> ---
On the following link, you can find my experiences of this issue on nouveau
with a GTX760 card: 
http://bugzilla.redhat.com/show_bug.cgi?id=1029224

Note that this bug only shows up when running high-end games on high graphics
settings.
Other games, like Xonotic don't exhibit this problem (even on high quality)
and
run very smooth (60-120fps). Nouveau seems to use the lowest clock speed: my
GPU idle temp is 32 degrees Celcius and climbs to only maximum 35 degrees
Celcius on full load. (so I am quite pleased with nouveau: good performance for
nearly no power consumption)

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--- Comment #10 from Mario Barrera <mbarrera at gmx.com> ---
(In reply to comment #9)
> On the following link, you can find my experiences of this issue on nouveau
> with a GTX760 card: 
> http://bugzilla.redhat.com/show_bug.cgi?id=1029224
> 
> Note that this bug only shows up when running high-end games on high
> graphics settings.
> Other games, like Xonotic don't exhibit this problem (even on high
quality)
> and run very smooth (60-120fps). Nouveau seems to use the lowest clock
> speed: my GPU idle temp is 32 degrees Celcius and climbs to only maximum 35
> degrees Celcius on full load. (so I am quite pleased with nouveau: good
> performance for nearly no power consumption)
My issue happens with Xonotic too. I dont know why.

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--- Comment #11 from Mario Barrera <mbarrera at gmx.com> ---
Created attachment 100185
  --> https://bugs.freedesktop.org/attachment.cgi?id=100185&action=edit
demonstrating more clearly the bug with glxgears

The bug being demonstrated with glxgears and resizing it to various window
sizes so how the artifacts change can be seen. Note that the artifacts
completely disappear when the scene rendering is smaller than a certain size.

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--- Comment #12 from Emil Velikov <emil.l.velikov at gmail.com> ---
Wild guess - perhaps it's LTCG related ?

You can easily check if that's the case my setting compressed = false in
nvc0_miptree.c:nvc0_miptree_create.

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--- Comment #13 from Mario Barrera <mbarrera at gmx.com> ---
(In reply to comment #12)
> Wild guess - perhaps it's LTCG related ?
> 
> You can easily check if that's the case my setting compressed = false
in
> nvc0_miptree.c:nvc0_miptree_create.
Seems like, I just did what you suggested and all artifacts are gone now (just
had to restart any OpenGL program after installing). So I confirm this
workaround works for me.
Thanks Emil.

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--- Comment #14 from Ben Skeggs <skeggsb at gmail.com> ---
It's worth retrying this with Linux 3.17.  I fixed a bug with the same
symptoms
on a macbook I had access to, but did not expect the same fix to be relevant
for the other boards where the issue was reported.

However, I've just had an email saying it's fixed for another guy, so,
it's
worth a try.

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Mario Barrera <mbarrera at gmx.com> changed:

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

--- Comment #15 from Mario Barrera <mbarrera at gmx.com> ---
(In reply to Ben Skeggs from comment #14)
> It's worth retrying this with Linux 3.17.  I fixed a bug with the same
> symptoms on a macbook I had access to, but did not expect the same fix to
be
> relevant for the other boards where the issue was reported.
> 
> However, I've just had an email saying it's fixed for another guy,
so, it's
> worth a try.
I just compiled Linux 3.17 and found that the bug won't happen with it.

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