@2vi1: Yeah, it overshoots at the bottom, too.

I found two work-arounds. From memory,

A.
1. select your wm, 
2. tab (once if I recall), 
3. press enter, then the dialogue window will change or go back to the log-in 
dialogue, 
4. input your password if you haven't done so already and see yourself log into 
the desktop environment of your choice.

Please feel free to correct me.

B.
Another work around is to uninstall unused window managers so as to make the 
drop down list shorter, optimizing use of screen real estate.

Comment:
I'd like to see this fixed, but there's two temporary "solutions".

Observation:
I gather this is happening because the system's difficulty in determining my 
monitor's EDID, as reported at 
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1047156


Side Question:
Might the system's difficulty in determining EDID drastically slow down boot 
up? I've run various diagnostics and my HD is fine, only one fan is out, which 
is noted by the Apple diagnostic. This MacBook Pro used to boot fine with prior 
versions of Ubuntu which didn't have this TFT issue.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to lightdm in Ubuntu.
https://bugs.launchpad.net/bugs/1047140

Title:
  lightdm overshoots physical screen size

Status in Light Display Manager:
  New
Status in “lightdm” package in Ubuntu:
  Confirmed

Bug description:
  Problem: lightdm displays excessively large

  Symptoms: I can't confirm change of window manager and top menu leaks
  over to right hand side.

  The screen is a LCD Citizen C19604HD that should run 1440x 900 at 60
  Hz. Upon entering the desktop the session is also excessively large,
  1224 x 768 (4:3) (apparently what's running in lightdm, as it offsets
  the same) and only allows a worse setting of 800 x 600 (4:3).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: lightdm 1.3.3-0ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-13.14-generic 3.5.3
  Uname: Linux 3.5.0-13-generic i686
  ApportVersion: 2.5.1-0ubuntu4
  Architecture: i386
  Date: Thu Sep  6 23:08:10 2012
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  SourcePackage: lightdm
  UpgradeStatus: Upgraded to quantal on 2012-08-18 (19 days ago)

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