[Bug 107334] Artifacts in Unigine Valley with RX 580

[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

            Bug ID: 107334
           Summary: Artifacts in Unigine Valley with RX 580
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: cwidmer@umbrox.de
        QA Contact: dri-devel@lists.freedesktop.org

Created attachment 140780
  --> https://bugs.freedesktop.org/attachment.cgi?id=140780&action=edit
Screenshot showing the issue

In a certain scene during the Unigine Valley benchmark, render artifacts
briefly flash on the screen multiple times. This does not occur with the same
card in another machine running Windows 10 -- neither with the DirectX 11 nor
with the OpenGL renderer -- and it does also not occur on this machine when
using a NVIDIA GeForce GTX 660 instead of the RX 580.
When I tried to get an apitrace, the benchmark slows down a lot during the
scene, skipping parts of it and not showing the artifacts. Additionally, the
replay is stuck on the loading screen and major shader compiler errors are
thrown.

I am using Gentoo with kernel 4.17.9 (with the gentoo patchset) and mesa git
(commit d0ee0a0a5d5fb658c87fed82cbcf9b48437abb2c).

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

--- Comment #1 from Christian Widmer <cwidmer@umbrox.de> ---
This is actually a regression. Bisecting identified commit
60299e9abe8513b36fe7979fbf36a99e4070e8d1 (radeonsi: don't emit partial flushes
for internal CS flushes only) as the one introducing the issue. And reverting
that commit in current master (0ddae4acae08cc6b216c49f85c6ffb969dea0969) does
indeed make the artifacts go away.

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

--- Comment #2 from Christian Widmer <cwidmer@umbrox.de> ---
Created attachment 140920
  --> https://bugs.freedesktop.org/attachment.cgi?id=140920&action=edit
glxinfo

I am adding glxinfo and lspci output, which might contain useful information.

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

--- Comment #3 from Christian Widmer <cwidmer@umbrox.de> ---
Created attachment 140921
  --> https://bugs.freedesktop.org/attachment.cgi?id=140921&action=edit
lspci

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

Christian Widmer <cwidmer@umbrox.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |bisected, regression

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

Timothy Arceri <t_arceri@yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #4 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Is this still a problem for you with Mesa git? I could not reproduce on my
RX480 with:

Kernel: 4.18.7
Mesa: 18be7403a11f53d58bbfe3905c0cacd6bc714492 
LLVM: 8.0.0 (svn)

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

--- Comment #5 from Timothy Arceri <t_arceri@yahoo.com.au> ---
Also I used: unigine-valley-1.1.7

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

--- Comment #6 from Christian Widmer <cwidmer@umbrox.de> ---
Unfortunately, I can still reproduce the issue with mesa git (commit   
18be7403a11f53d58bbfe3905c0cacd6bc714492) and kernel 4.18.9. I am, however, on
LLVM 7.0.0 and have not yet tried a recent git master. I will try that in the
near future and see if it makes a difference.

I assume Unigine Valley 1.1.7 refers to the phoronix test profile version as
upstream only has version 1.0, which is the one I am using (with the Extreme HD
preset) and that is also the one downloaded by the test profile[1].

[1]
https://github.com/phoronix-test-suite/test-profiles/blob/master/pts/unigine-valley-1.1.7/downloads.xml

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

--- Comment #7 from Christian Widmer <cwidmer@umbrox.de> ---
Just tried it with mesa git (at 64731e7c5e4bdd23e6b3fd23d3611b3c766301c7) and
LLVM git (at 7840e607b9952273c71edd8997d22e6431cc927b) and the issue still is
there.

I have also tried another apitrace after my previous post which unfortunately
still does not work. I can create a trace but the exact scene with the issue
always behaves strange. Once it stayed black for a while after which it
rendered faster than it should. When I tried tracing again it rendered but the
issue did not appear. Additionally, none of the generated traces replayed
correctly, they all only showed the loading screen although there size was
about what would be expected by a correct trace.

If there is any information I could provide to help with solving this issue,
just let me know.

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

--- Comment #8 from Christian Widmer <cwidmer@umbrox.de> ---
I took the recently released kernel 4.19 as an incentive to test this again and
it looks like the issue is gone. I do, however, not know if it is indeed the
new kernel driver part or a mesa/LLVM update that happened in the meantime (I
did not test it after every update).

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

--- Comment #9 from Christian Widmer <cwidmer@umbrox.de> ---
Out of curiosity I just tested it with kernel 4.18.14 and could not reproduce
the issue there, either. This most likely means it was some other update in the
meantime. I recently updated libdrm from version 2.4.93 to 2.4.96 which might
also possibly be one of the changes that could have made the artifacts
disappear. Nonetheless, I am glad that they are, albeit somewhat magically,
gone.

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[Bug 107334] Artifacts in Unigine Valley with RX 580

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https://bugs.freedesktop.org/show_bug.cgi?id=107334

Christian Widmer <cwidmer@umbrox.de> changed:

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

--- Comment #10 from Christian Widmer <cwidmer@umbrox.de> ---
The issue still has not reappeared and nobody else seems to have this problem
so I am going to close this as resolved.

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