I installed the amd64 mainline kernel packages from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.13-rc7-trusty/
according to your instructions and the issue still occurs.  When I
tested, it happened every time, 5 times in a row.  I'll update the
status and tags to reflect it.

Another note about the IRQ problem - this window disappearing issue
happens whether or not the IRQ is disabled during boot.  When it's
disabled, my mouse is really sluggish and then when it isn't, my mouse
is just fine.  It happens at seemingly-random times - sometimes I boot
and it comes up, and other times when I boot it doesn't.  So I guess I
am experiencing the IRQ symptom of a hardware device not working
correctly, but it doesn't affect whether or not I can reproduce this
bug.

** Tags added: kernel-bug-exists-upstream kernel-bug-exists-
upstream-v3.13-rc7

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1257327

Title:
  Ubuntu 13.10 dual monitor screen lock causes windows to disappear off-
  screen

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