Through a process of disk snapshotting, apt-mark holding certain
packages, and bisecting the dist-upgrade, I've narrowed it down to one
of the following packages.  I'm unable to narrow it down any further.
This is the output of `apt-get dist-upgrade --dry-run`

The following packages will be upgraded:
  xserver-common xserver-xorg-core xserver-xorg-video-ati
  xserver-xorg-video-intel xserver-xorg-video-nouveau
  xserver-xorg-video-radeon xserver-xorg-video-vmware xvfb
8 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Inst xserver-common [2:1.17.1-0ubuntu3] (2:1.17.1-0ubuntu4 Ubuntu:15.10/wily 
[all])
Inst xserver-xorg-core [2:1.17.1-0ubuntu3] (2:1.17.1-0ubuntu4 Ubuntu:15.10/wily 
[amd64])
Inst xserver-xorg-video-radeon [1:7.5.0-1ubuntu2] (1:7.5.0-1ubuntu3 
Ubuntu:15.10/wily [amd64])
Inst xserver-xorg-video-ati [1:7.5.0-1ubuntu2] (1:7.5.0-1ubuntu3 
Ubuntu:15.10/wily [amd64])
Inst xserver-xorg-video-intel [2:2.99.917-1~exp1ubuntu2.2] 
(2:2.99.917-1~exp1ubuntu3 Ubuntu:15.10/wily [amd64])
Inst xserver-xorg-video-nouveau [1:1.0.11-1ubuntu2build1] (1:1.0.11-1ubuntu3 
Ubuntu:15.10/wily [amd64])
Inst xserver-xorg-video-vmware [1:13.1.0-0ubuntu1build1] 
(1:13.1.0-0ubuntu1build2 Ubuntu:15.10/wily [amd64])
Inst xvfb [2:1.17.1-0ubuntu3] (2:1.17.1-0ubuntu4 Ubuntu:15.10/wily [amd64])
Conf xserver-common (2:1.17.1-0ubuntu4 Ubuntu:15.10/wily [all])
Conf xserver-xorg-core (2:1.17.1-0ubuntu4 Ubuntu:15.10/wily [amd64])
Conf xserver-xorg-video-radeon (1:7.5.0-1ubuntu3 Ubuntu:15.10/wily [amd64])
Conf xserver-xorg-video-ati (1:7.5.0-1ubuntu3 Ubuntu:15.10/wily [amd64])
Conf xserver-xorg-video-intel (2:2.99.917-1~exp1ubuntu3 Ubuntu:15.10/wily 
[amd64])
Conf xserver-xorg-video-nouveau (1:1.0.11-1ubuntu3 Ubuntu:15.10/wily [amd64])
Conf xserver-xorg-video-vmware (1:13.1.0-0ubuntu1build2 Ubuntu:15.10/wily 
[amd64])
Conf xvfb (2:1.17.1-0ubuntu4 Ubuntu:15.10/wily [amd64])

The other bit of information I can give is that if I apt-mark unhold all
of these except xserver-xorg-video-vmware, when I reboot I get a "low
graphics" warning and get dumped into a text console.  If I unhold them
all, I get the screen occlusion as described above.

** Changed in: xorg (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1464365

Title:
  Resolution is incorrect; screen mostly occluded

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