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This property defines how a non-native mode is upscaled to the native mode of an LCD panel: None: No upscaling happens, scaling is left to the panel. Not all drivers expose this mode. Full: The output is upscaled to the full resolution of the panel, ignoring the aspect ratio. Center: No upscaling happens, the output is centered within the native resolution the panel. Full aspect: The output is upscaled to maximize either the width or height while retaining the aspect ratio. This property should be set up by calling drm_connector_attach_scaling_mode_property(). Note that drivers can also expose this property to external outputs, in which case they must support "None", which should be the default (since external screens have a built-in scaler).