I had the issue described above, and decided to give the nouveau driver
a try instead of the proprietary nvidia driver I had been using.  I
cleared out all graphics card and monitor related sections from
xorg.conf file and replaced simply with

Section "Device"
    Identifier     "nvidia card"
    Driver         "nouveau"
    Option         "GLXBlank" "true"
EndSection

then launched in gnome-control-center and arranged the monitors next to
one another.  Now the lock screen dialog always shows up on the monitor
the mouse was last set.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-screensaver in Ubuntu.
https://bugs.launchpad.net/bugs/848562

Title:
  gnome-shell lock screen does not display password prompt

Status in GNOME Screensaver:
  Invalid
Status in GNOME Shell:
  Fix Released
Status in “gnome-screensaver” package in Ubuntu:
  Confirmed

Bug description:
  I have two monitors, the laptop screen and an external one connected
  via display port.

  When I do 'ctrl-alt-L' in gnome-shell to lock the screen, the laptop
  screen displays the screen background and the second monitor displays
  whatever was on it before locking the screen.

  When I press a key, no password prompt appears - the laptop continues
  to display the background. However, entering the password at this
  point unlocks the computer.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gnome-shell 3.1.90.1-0ubuntu4
  Uname: Linux 3.1.0-rc6-git-20110913.0846 x86_64
  ApportVersion: 1.22.1-0ubuntu2
  Architecture: amd64
  Date: Tue Sep 13 11:42:07 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta amd64 (20110330)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to oneiric on 2011-09-12 (0 days ago)

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