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GS_FAST_LAUNCH=1 shouldn't be used on GFX11 but it's still needed for dGPUs (eg. NAVI31) because it destroys performance for unknown reasons. On RDNA3 APUs, GS_FAST_LAUNCH=2 seems to be required for working mesh shaders and performance is fine. There is possibly a firmware bug on APUs that would explain why GS_FAST_LAUNCH=1 doesn't work on Phoenix. Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10583 Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/10397 Cc: mesa-stable Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27618>