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We are seeing frequent hangs in other workloads when something using mesh shaders runs at the same time, so gate the feature behind an environment variable until we figure out what's going on. v2: (Sagar) - Give the mesh enabled variable a more descriptive name Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Emma Anholt <emma@anholt.net> Reviewed-by: Sagar Ghuge <sagar.ghuge@intel.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22910>