(the stack of commit from 2013-10-22 on http://cgit.freedesktop.org/xorg/xserver/log/Xext/sync.c?h=server-1.14-branch is likely needed as well)
(the stack of commit from 2013-10-22 on http://cgit.freedesktop.org/xorg/xserver/log/Xext/sync.c?h=server-1.14-branch is likely needed as well)