backends/drm: only accept xrgb with legacy
xrgb is effectively universally supported, other formats may not be. In order to make sure things work everywhere, assume only xrgb is supported.
parent
83275c3f
xrgb is effectively universally supported, other formats may not be. In order to make sure things work everywhere, assume only xrgb is supported.
mentioned in commit b8b912df
·mentioned in commit b8b912df