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tests: intel_blackhole: ensure the blackhole state is disabled to readback surfaces

Lionel Landwerlin requested to merge llandwerlin/piglit:review/intel-blackhole-gen9-no-llc-fix into master

On small cores Gen platforms, memory coherent through LLC is not guaranteed and so we read the content of written surfaces using the GPU instead of directly CPU reads.

The problem is that this won't work if the blackhole state is active as those readback commands will be skipped.

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com

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