Created attachment 1246619 [details] testcase Description of problem: See the attached testcase. Compile it and hit "C" key. Screen is cleared and one box should be rendered. What the testcase does is that clear wl_buffer[0], attach to wl_surface and paint. Then another wl_buffer[1] is choosen, data is copied from wl_buffer[0] to have the same content and then a box is rendered. Then new wl_buffer is attached and Weston invalidates whole wl_buffer area automatically but mutter does not do so which causes different results on mutter/weston. Mutter invalidated only area which is specified by wl_surface_damage().
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