Open source radeon driver

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http://forums.fedoraforum.org – Is anyone using the open source radeon driver with a modernish card and succes? I have an HD 6570 so it's a couple year old technology. X will boot up ok with a 3.9 series kernel (I have a Fedora 18 install and the fedora 19 rescue both have 3.9). The 3.10 series in Fedora 18 repeatedly reboots with a hypertransport error. Anything beyond 3.11 (Fedora 18 and 19), I get a white screen when X boots and the console (ctl-alt-f2) shows a GPU lockup. I've tried a number of boot options for the driver and tried setting up an xorg.conf to turn stuff on and off to no avail. I do have glamor (HowTos)