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[ Upstream commitd6a5758866] Disable MCBP(mid command buffer preemption) by default as old Mesa hangs with it. We shall not enable the feature that breaks old usermode driver. Fixes:50a7c8765c("drm/amdgpu: enable mcbp by default on gfx9") Signed-off-by: Jiadong Zhu <Jiadong.Zhu@amd.com> Acked-by: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin <sashal@kernel.org>