Public bug reported:

Hardware:
HP envy 23:
- Intel Core i7 3770s
- 8 GB DDR3-1600
- Radeon HD 7450A
- Hard drive: 1 TB SATA
- exact technical spec:
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03683196&cc=ad&dlc=en&lc=en&jumpid=reg_r1002_usen_c-001_title_r0001#N1445


How to reproduce:
Start ubuntu with a live media ubuntu-13.04-desktop-amd64 on USB.
-> ubuntu is recognized by the EFI firmware and can be booted
-> grub is started and "Try ubuntu without installation" is selected
-> the screen turns purple; the ubuntu logo appears; and the five white point 
are turning red one by one
-> the screen gets frozen with all five points being red. No login appears. No 
GUI appears. The mouse can still be moved.


Actions taken:
<ctrl> + <alt> + F1 leads to a shell but X can not be restarted


Further information:
1. The same machine works ok on Windows 8
This means that it pretty sure, that this is not a hardware issue
2. The same machine has similar problems with other ubuntu and fedora releases:
- ubuntu 12.04.02 LTS Live hangs always at starting up X and never gets to the 
first "end-user-screen"
- ubuntu 12.10 Live boots correctly and the system can be installed. However 
also some very similar freezes occur.
- fedora 18 has some very similar freezes

What can I do to fix or circumvent the bug?
What additional information is required and how can I generate this info?

** Affects: xorg-server
     Importance: Undecided
         Status: New

** Affects: ubuntu
     Importance: Undecided
         Status: New

** Affects: fedora
     Importance: Unknown
         Status: Unknown

** Bug watch added: Red Hat Bugzilla #948641
   https://bugzilla.redhat.com/show_bug.cgi?id=948641

** Also affects: fedora via
   https://bugzilla.redhat.com/show_bug.cgi?id=948641
   Importance: Unknown
       Status: Unknown

** Also affects: xorg-server
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1178026

Title:
  ubuntu-13.04-desktop-amd64 freezes at startup

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