https://bugs.freedesktop.org/show_bug.cgi?id=28771
--- Comment #1 from Jesse Barnes jbarnes@virtuousgeek.org 2010-06-28 09:31:56 PDT --- You need both:
commit 234286c0f8b7d30ed49223c648d4c73c1a517ab3 Author: Jesse Barnes jbarnes@virtuousgeek.org Date: Thu Apr 22 12:47:41 2010 -0700
DRI2: add config query extension
and
commit 45e2b51c853471b79004a954ce3092a253b20b77 Author: Jesse Barnes jbarnes@virtuousgeek.org Date: Thu Apr 22 12:49:03 2010 -0700
DRI2/GLX: check for vblank_mode in DRI2 GLX code
for vblank_mode to work. Does your Mesa build have those?