Just tried with latest 13.10-daily 
(http://cdimage.ubuntu.com/daily-live/current/saucy-desktop-amd64.iso)
and it works just fine:
    1. The LiveUSB boots up and it works when I "Try Ubuntu".
    2. Connecting and disconnecting an HDMI monitor works as expected. 

The kernel in the Ubuntu 3.10 Daily DVD is 3.9.0-3-generic.

I am willing to help figure out which package causes the problem with 
13.04/12.04.2. 
Could it be the kernel or something else?

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https://bugs.launchpad.net/bugs/1123024

Title:
  Screen flickering at login screen

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