[Bug 107356] [kbl] [drm] GPU hang in Antutu 7.x games with 4.14.52 kernel

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107356

--- Comment #27 from Tapani Pälli <lemody at gmail.com> ---
(In reply to Ren Chenglei from comment #26)
> Tapani, do we have support GL_PATCHES in mesa, which is only available with
> GLES 3.2 or greater.
> https://www.khronos.org/registry/OpenGL-Refpages/es3/

Yes, we do support GL_PATCHES which is used with tessellation. This is good
hint though, we could perhaps trace the actual frame that causes the hang ..
unfortunately currently we don't have a way to take GL traces on Android :/ But
we could dump the shaders at point when such draw call arrives.

> When the mode is GL_PATCHES, we skip the draw, and the GPU hang can't be
> reproduced. 
> 
> BTW, the screen will be black in the first part test, I commented function:
> _mesa_set_draw_vao(ctx, ctx->Array.VAO, enabled_filter(ctx));
> It will be better, but there is still some issue.

Yep we can't really skip these calls, they are necessary so that we have
correct VAO in place.

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