Ok, then try the following. Go to /et/X11/xorg.conf Find if you have the line 
DRI "off"
If it is not there, put it in the "Device" Section 
Reboot with the radeon.modeset=0 kernel boot option (or the one you mentioned). 
See if it gives you any result.

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-ati in Ubuntu.
https://bugs.launchpad.net/bugs/577340

Title:
  [RC410] Xpress 200M hangs when resuming from suspend with DRI, with or
  without KMS

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