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When the buffer modifier is DRM_FORMAT_MOD_LINEAR, we can use the old code path. That means not specifying any modifier parameter. It was an issue when the primary GPU was creating a linear GBM surface and that a secondary GPU (not supporting modifiers) was trying to import it. It was failing because the driver could not use the import_modifiers extension even though it could in theory easily import the buffer. https://gitlab.gnome.org/GNOME/mutter/issues/18