Bug#910846: User error.

[Gong S.]

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Using "glamor" instead of "EXA" works. However, the manpage says "EXA (for pre-TAHITI GPUs) and glamor (for R300 or higher)". TURKS GPUs are pre-TAHITI ones.
I cannot test the patch for you. I have said, I am no developer, and I do not want to mess up my OS by recompiling an important package.
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