It could be, that the connector table of your card is broken. Could everyone, 
who gets a black screen please try to set the HDP option as described in 
section "10.5. My monitor isn't detected" in [1] ?
Unfortunately there are two drivers for your graphics chip, one is called 
radeonhd, the other one is called radeon. Please test for both drivers and 
report back here.
Thanks!

[1] http://www.x.org/wiki/radeonhd

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[RV610] black screen at logon screen on 1st boot after install
https://bugs.launchpad.net/bugs/273510
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