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This ensures that the screen pixmap contents have been initialized when the initial modes are set. (Ported from radeon commits 673e1c7637687c74fc9bdeeeffb7ace0d04b734f and 1584dc545c78e0bce8d4b4b9f26b568e2c211453) Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
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