[Bug 97890] Kerbal Space Program freezes randomly when DRI3 is enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97890

            Bug ID: 97890
           Summary: Kerbal Space Program freezes randomly when DRI3 is
                    enabled
           Product: Mesa
           Version: 12.0
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i965
          Assignee: idr at freedesktop.org
          Reporter: jajcus at jajcus.net
        QA Contact: intel-3d-bugs at lists.freedesktop.org

With recent KSP 1.2 pre-releases freeze randomly unless LIBGL_DRI3_DISABLE=1 is
used.  (KSP 1.1 was hardly usable on Linux due to many bugs in the Unity 3D
version used then)

I got best results (no freezes) on my Haswell laptop using the following steam
launch options: 'LIBGL_DRI3_DISABLE=1 %command%_64 -force-glcore'

As soon I drop the 'LIBGL_DRI3_DISABLE=1', the game would freeze – it could
happen as early as on the loading screen, or several minutes into the game
play.

Mesa 12.0.2, 12.0.3
Linux kernel 4.7.1
libdrm 2.4.70

KSP builds 1.2.0.1473 – 1.2.0.1517

The same freezes happened on my work PC – Skylake-based.

KSP bug report: http://bugs.kerbalspaceprogram.com/issues/11420

It might be another Unity 3D bug, but it might be a driver problem.

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