[Bug 100010] Support for SandyBridge (Gen6) is broken in 12.x and 13.x branches

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Feb 28 18:12:30 UTC 2017


--- Comment #2 from mgorchak at qnx.com <mgorchak at qnx.com> ---
Created attachment 129987
  --> https://bugs.freedesktop.org/attachment.cgi?id=129987&action=edit
High polygon count tesselation test

Similar issues could be reproduced with following small test (I hope with it
there much less efforts required to debug Mesa3D rather than using

This test is designed to be run under Screen/QNX environment, so you have to
modify gles1-teapot.c module and add there your windowing system
initialization, the rest parts are cross-platform.

This test uses GL evaluators ported to OpenGL ES 1.1 and classic teapot model
for GL evaluators. This allows to generate high polygon models in runtime for

If you run test with option -tpttess=XXX it creates data for:

    Vertices:  209952
    Faces:     204800

    Vertices:  326432
    Faces:     320000

    Vertices:  468512
    Faces:     460800

    Vertices:  508032
    Faces:     500000

    Vertices:  524288
    Faces:     516128

all values starting from 100 kills Gen6 GPU completely.

I tested this on:
Gen6 GPU (SandyBridge) - kills GPU.
Gen7 GPUs (BayTrail, IvyBridge, Haswell) - works perfectly.
Gen8 GPU (Broadwell) - works perfectly.
Gen9 GPUs (Broxton, SkyLake) - works perfectly.

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