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This ensures the scanout pixmaps used for Option "TearFree" and Option "ShadowPrimary" have been initialized when their initial mode is set. (Ported from radeon commit a4a8cdbcc10c1c5f07485a2af9e9e81e490c3e1d) Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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