[Bug 109732] DiRT Rally has extreme graphical corruption and performance loss

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109732

            Bug ID: 109732
           Summary: DiRT Rally has extreme graphical corruption and
                    performance loss
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/Iris
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: leozinho29_eu at hotmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org

It was observed extreme graphical corruption on DiRT Rally when using Iris. The
elements on screen have trouble to disappear, creating more and more artifacts
as the game is played. It was also observed a 40 FPS loss.

Below are the images showing it using Iris and using i965:

Launcher:

Iris: https://i.imgur.com/kTOfjV3.png
i965: https://i.imgur.com/2YaX2AR.png

Game: 

Iris: https://i.imgur.com/7qYPSzD.png
i965: https://i.imgur.com/3HpnUva.png

I understand Iris was just added to the main Mesa repository, thank you for the
effort. I'm reporting this to make you aware of its behavior on DiRT Rally.

System specifications:

Processor: Intel Core i3-6100U;
Video: Intel HD Graphics 520;
Architecture: amd64;
RAM memory: 8 GB;
Mesa: 19.1.0-devel (git-cd0ced49e7);
Kernel version: 4.18.0-15-lowlatency;
Distribution: Xubuntu 18.04.1 amd64.

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