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[Andrea Bernabei <andrea.bernabei@xxxxxxxxxxxxx>]

I hit this bug today 
on vivid overlay PPA.

My laptop was not booting anymore. I was adviced to reinstall the older
xserver-xorg-core (1.17.1-0ubuntu3) and that fixed it.

The overlay ppa currently offers:
xserver-xorg-core ---> 1.17.2-1ubuntu0.1~overlay1    (and this is the version causing issues)
xserver-xorg-video-intel ----> 2:2.99.917-1~exp1ubuntu2.2   (and this version doesn't seem to contain the fix)

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https://bugs.launchpad.net/bugs/1462994

Title:
  2:1.17.1-0ubuntu4 broke xmir ABI

Status in xorg-server package in Ubuntu:
  Won't Fix
Status in xserver-xorg-video-ati package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-nouveau package in Ubuntu:
  Fix Released

Bug description:
  I noticed this morning that after I logged in unity-settings-daemon
  was getting an assertion failure.

    ERROR:gsd-rr-config.c:661:gsd_rr_config_load_current: assertion
  failed: (gsd_rr_config_match (config, config))

    ** (unity-settings-daemon:2293): WARNING **: Attempted to init
  Xsync, found version 3.1 error base 134 event base 83

  which was terminating it and leaving me with a not really functional
  desktop.

  After debugging for a while I found this in Xorg.0.log

    [    81.641] (EE) Failed to load
  /usr/lib/xorg/modules/drivers/nouveau_drv.so:
  /usr/lib/xorg/modules/drivers/nouveau_drv.so: undefined symbol:
  xorgMir

  i.e. my driver was failing to load which had these knock on effects.

  It seems that nouveau is using this symbol from xorg, and it's now
  gone as of the latest xmir related upload
  (http://launchpadlibrarian.net/208141145/xorg-
  server_2%3A1.17.1-0ubuntu3_2%3A1.17.1-0ubuntu4.diff.gz). After
  rebuilding it works again, but I think that xmir support probably got
  disabled, because of the following in xxv-nouveau's src/nv_type.h:

    #ifdef XMIR
    #include "xmir.h"
    #include "xf86Priv.h"
    #else
    typedef struct xmir_screen xmir_screen;
    #define xorgMir 0
    #endif

  XMIR isn't defined any more.

  Please could you investigate if there is any other breakage and fix up
  as necessary? I'm going to upload a rebuild of nouveau so nobody else
  has these problems but there will be further cleanup required. Would
  be ideal to use packaging to force users to never be in a broken
  situation, even if just versioned Breaks if you want to avoid doing a
  transition.

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