[Bug 96425] [bisected] occasional dark render in The Talos Principle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96425

            Bug ID: 96425
           Summary: [bisected] occasional dark render in The Talos
                    Principle
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: notasas at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: jason at jlekstrand.net, kenneth at whitecape.org,
                    mattst88 at gmail.com

Created attachment 124387
  --> https://bugs.freedesktop.org/attachment.cgi?id=124387&action=edit
screenshot

After some recent game's update the game renders way too dark when viewing
certain objects. The problem goes away or reappears depending on camera
position. Reproduces on both Haswell and Skylake, works fine on r600g and
llvmpipe. Mesa 10.1.3 does not have such problems so I've ran a bisect:

commit d47405eb707b9921f70454049677a9d504ee3fa6
Author: Jason Ekstrand <jason.ekstrand at intel.com>
Date:   Fri Apr 10 16:24:11 2015 -0700

    i965: Use NIR by default for fragment shaders

Unfortunately the trace is rather large because the problem usually shows up
further from save points. It shows up in the last frame of this trace:
https://drive.google.com/file/d/0Bz8fw_SGGDzsejZiR1Y1anN3aHM/view?usp=sharing

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