Quote Originally Posted by bridgman View Post
OK, let's start switching things off and try to see what function is causing the problem. Run "man radeon" and look through the output to find the xorg conf option to disable acceleration. Put that in your xorg.conf and start again.
Started with dpkg -reconfigure -phigh xserver-xorg to get a clean xorg.conf... Then added:

Section "Device"
	Identifier	"Configured Video Device"
	Driver		"radeon"
	Option		"NoAccel"		"true"
	Option		"UseFBDev"		"true"
UseFBDev true - came from the dpkg -reconfigure, so I left it...

The result... OMG... I have native resolution again... I can't believe I didn't think about trying that, but I'll be the first to admit I've been stabbing in the dark...

So what next, the issue is now totally reproducible - NoAccell fixes it... I'd like to get a fully functional card back.

Thanks to everyone who has chimed in here!