Ok, I tested with a fresh ISO from:

http://cdimage.ubuntu.com/ubuntu-desktop-next/daily-live/current/

downloaded a few hours ago.  Booting off of a USB flash drive, it does
successfully leave the screen on, set video mode to 1920x1080, and have
a working framebuffer console.  Unfortunately, it seems the graphics
driver crashes every 5-10 seconds as indicated by kernel errors which
show up on the console.  It does start X (lightdm) but quickly crashes
after 5-10 seconds of use, locks for several seconds, and then dumps an
error to the console.  This repeats every time I try to start lightdm,
so I can't get in and test more.  I took a video of the whole boot
sequence until the error occurs:

https://www.youtube.com/watch?v=jlgpN9xT2i0

I'm attaching some stills from this video for easy viewing - the first
is the error that continuously appears in the kernel log and the second
is the mess that prints out after lightdm crashes.

** Attachment added: "Error from kernel log that repeatedly prints"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1349679/+attachment/4166366/+files/vlcsnap-2014-07-30-23h08m10s61.png

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https://bugs.launchpad.net/bugs/1349679

Title:
  Ubuntu 14.10 - No display with kernel 3.16 generic on HP dv6z 7000
  (AMD APU + AMD GPU)

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