2.20.15 release

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

NEWS

@@ -1,3 +1,21 @@
+Release 2.20.15 (2012-12-03)
+============================
+And lo, enabling more of the common acceleration paths for gen4 revealed
+another lurking bug - something is wrong with how we prepare Y-tiling
+surfaces for rendering. For the time being, we can surreptiously disable
+them for gen4 and avoid hitting GPU hangs.
+
+ * Avoid clobbering the render state after failing to convert the
+   operation to use the blitter.
+   https://bugs.freedesktop.org/show_bug.cgi?id=57601
+
+ * Disable shadow tracking upon server regeneration, and so fix a crash
+   if you restart the server whilst a RandR transform (e.g. rotation) is
+   in effect.
+   https://bugs.freedesktop.org/show_bug.cgi?id=52255
+   https://bugs.freedesktop.org/show_bug.cgi?id=56608
+
+
 Release 2.20.14 (2012-11-26)
 ============================
 The highlight of this release is gen4, from 965g to gm45. Quite an old

configure.ac

@@ -23,7 +23,7 @@
 # Initialize Autoconf
 AC_PREREQ([2.60])
 AC_INIT([xf86-video-intel],
-        [2.20.14],
+        [2.20.15],
         [https://bugs.freedesktop.org/enter_bug.cgi?product=xorg],
         [xf86-video-intel])
 AC_CONFIG_SRCDIR([Makefile.am])