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

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100010

--- 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
glBenchmark).

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
tests.

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

80:
    Vertices:  209952
    Faces:     204800

100:
    Vertices:  326432
    Faces:     320000

120:
    Vertices:  468512
    Faces:     460800

125:
    Vertices:  508032
    Faces:     500000

127:
    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.

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-3d-bugs/attachments/20170228/6dacd67f/attachment-0001.html>