Daniel,
so radeonhd gives you no picture at all. Could you please remove the HPD option 
from your xorg.conf again and then start x with:
startx -- -logverbose 7
And then please load up the xorg.0.log.
I need just a bit more information: Which brand has you radeon HD3450, and 
which monitor do you try to connect over which connection (VGA/DVI/HDMI...)?
Then I'll forward your bug report, thanks! :)

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[RS690M] screen randomly blanks for short times
https://bugs.launchpad.net/bugs/310864
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