Yes, thanks. I saw that. I took a look at the log file, you uploaded
there:

(WW) Warning, couldn't open module fgl.renamed.libdri
(II) UnloadModule: "fgl.renamed.libdri"
(EE) Failed to load module "fgl.renamed.libdri" (module does not exist, 0)
(II) LoadModule: "radeonhd"
(WW) Warning, couldn't open module radeonhd
(II) UnloadModule: "radeonhd"
(EE) Failed to load module "radeonhd" (module does not exist, 0)
(EE) No drivers available.

Sure that the radeonhd driver is installed in that case? If not install it with 
a 'sudo apt-get install xserver-xorg-video-radeonhd'. If you want to compile 
from the source this link is helpful: 
https://help.ubuntu.com/community/RadeonHD 
You could also try a minimal xorg.conf, which only contains the following:

Section "Device"
        Identifier      "Configured Video Device"
        Driver          "radeonhd"      
EndSection

-- 
[HD3470 + HD3200] Dual cards prevents X from starting / black screen
https://bugs.launchpad.net/bugs/311748
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