https://bugs.freedesktop.org/show_bug.cgi?id=32556
--- Comment #13 from Alex Deucher agd5f@yahoo.com 2010-12-23 10:49:28 PST --- How about:
pll->flags |= (RADEON_PLL_USE_FRAC_FB_DIV | RADEON_PLL_PREFER_CLOSEST_HIGHER);
Can you also attach a copy of your vbios? (as root) (use lspci to get the bus id) cd /sys/bus/pci/devices/<pci bus id> echo 1 > rom cat rom > /tmp/vbios.rom echo 0 > rom