See the discussion around: http://lists.freedesktop.org/archives/xorg-devel/2009-September/002024.html The server currently uses RENDER_MAJOR/RENDER_MINOR to announce its protocol versions. If the protocol is updated, the server may announce versions it doesn't actually support. TODO: which protocols are affected by this?
Fixed http://cgit.freedesktop.org/xorg/xserver/commit/?id=55747d256d759850141e4a9c4dec965616a31dc8
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