https://bugs.freedesktop.org/show_bug.cgi?id=88658
--- Comment #10 from Michel Dänzer michel@daenzer.net --- Created attachment 113144 --> https://bugs.freedesktop.org/attachment.cgi?id=113144&action=edit st/mesa: Don't use PIPE_USAGE_STREAM for unpack PBOs
Does this Mesa patch help?