Thanks for providing the Xorg.0.log.  It looks like your monitor is
providing invalid EDID:

(II) RADEON(0): EDID vendor "XXX", prod id 0
(II) RADEON(0): DDCModeFromDetailedTiming: Ignoring tiny 1x1 mode
(II) RADEON(0): Using EDID range info for horizontal sync
(II) RADEON(0): Using EDID range info for vertical refresh
(II) RADEON(0): Printing DDC gathered Modelines:
(II) RADEON(0): Modeline "800x600"x0.0   40.00  800 840 968 1056  600 601 605 
628 +hsync +vsync (37.9 kHz)

Notice prod id 0, and the x0.0 refresh rate in the modeline there.
Looks like it's using some sort of NULL'd edid.  Weird.

Please collect the output from the following commands:

 # ddcprobe
 # get-edid | parse-edid
 # xrandr --verbose

As well, test setting this in xorg.conf:

 Section "Device"
      ...
      Option "IgnoreEDID" "1"
 Section

It would also be useful to see the xorg.conf and the Xorg.0.log from
your OpenSuSE failsafe session.

** Changed in: xserver-xorg-video-ati (Ubuntu)
       Status: Confirmed => Incomplete

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Kubuntu live CD (and install) hangs during boot on Vaio PCG-K215Z [Radeon 9200]
https://bugs.launchpad.net/bugs/221329
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