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            <b><a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED - nouveau E[ DRM] fail ttm_validate"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=59069#c34">Comment # 34</a>
              on <a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED - nouveau E[ DRM] fail ttm_validate"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=59069">bug 59069</a>
              from <span class="vcard"><a class="email" href="mailto:swine@pobox.com" title="peter swain <swine@pobox.com>"> <span class="fn">peter swain</span></a>
</span></b>
        <pre>(In reply to peter swain from <a href="show_bug.cgi?id=59069#c33">comment #33</a>)
<span class="quote">> my issue was resolved by update yesterday,</span >
by xserver-xorg-video-nouveau                                           
1:1.0.12+git1512080732.b18bc0~gd~w
from
deb <a href="http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu">http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu</a> wily main


Peeking into logs, it looks like this commit was responsible,
as the issue looks similar ...
author    Mario Kleiner <<a href="mailto:mario.kleiner.de@gmail.com">mario.kleiner.de@gmail.com</a>>    2015-06-28 00:33:49
(GMT)
committer    Ben Skeggs <<a href="mailto:bskeggs@redhat.com">bskeggs@redhat.com</a>>    2015-11-17 05:55:42 (GMT)
commit    6e6d8ac1c7b4ee047a7b40b95dea1e65a7c3211a
  "Take shift in crtc positions for ZaphodHeads configs into account"</pre>
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