[Bug 84104] Ring hang with geometry shaders on SNB

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84104

--- Comment #8 from Iago Toral <itoral at igalia.com> ---
One last piece of info: setting GEN6_GS_DISCARD_ADJACENCY in the _3DSTATE_GS
command does not remove the hang either. I guess this means that the hang
occurs before the GS payload is delivered and definitely before any GS program
can be executed. I guess this makes sense, since otherwise it would be
difficult to explain why this hangs only with glDrawElements.

Based on all the analysis so far, I suspect that the hang is happening at the
VS stage when accessing vertex data for GL_TRIANGLE_STRIP_ADJACENCY primitives
when repeating indices are provided via glDrawElements.

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