X.org is an evolution from the XFree86 project, that became the widely accepted "reference" implementation in 2004. X.org improves upon XFree86 in terms of the way the project is coordinated, the way the codebase is organised and the approach to graphics acceleration.
The X.org team is hard at work on a new Acceleration Architecture, as well as the inclusion of a variety of exciting new X features such as window composition (which allows for sexy transparency effects).
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Bug #1518021: /usr/bin/Xorg:6:sna_dri2_event_free:sna_dri2_schedule_flip:sna_dri2_schedule_swap:DRI2SwapBuffers:ProcDRI2SwapBuffers
Reported on 2015-11-27
Bug #1511484: X.Org random crashes on Ubuntu 15.10
Reported on 2015-10-29
Bug #1510941: /usr/bin/Xorg:6:copy_overlap:sna_render_copy_boxes__overlap:gen7_render_copy_boxes:__sna_dri2_copy_region:dri2_copy_region
Reported on 2015-10-28
Bug #1492753: Screen rotation broken in Wily
Reported on 2015-10-21
Bug #1502052: /usr/bin/Xorg:6:_list_del:list_del:__kgem_retire_rq:__kgem_retire_requests_upto:kgem_bo_retire
Reported on 2015-10-14