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0e1f616
(Get the code!)
Thanks for reporting this bug.
It sounds like there are at least two issues here. First, that in safe graphics mode it is not detecting your radeon card; safe graphics mode ought to *always* work. Second, that it is not detecting your monitor.
The second issue is already known (bug 3731), so I'm going to focus this bug report on the first issue.
However, it sounds like you've worked around the first issue. For the second issue, the workaround is to add the HorizSync and VertRefresh rates for your monitor. Currently it is using generic values which probably aren't appropriate for your monitor. Usually you can find this info from your monitor's manual, or by looking on the monitor manufacturer's website in their support channels. If you do find this info, can you please report it back here so we can add it to our database so it works in future versions of ubuntu?