I have problems with my PowerColor HD6670 card and open source drivers. I tested my card with Ubuntu 12.04, 12.10, Linux Mint and in last days with Ubuntu 13.10 but everytime I have the same problems - screens artifacts and randomly kernel panic crash. On my screen I see many small coloured lines in random places (background of desktop is visible) and after few seconds (sometimes after some minutes) my PC crash - kernel panic. My platform is following:
MSI K9A2 Platinum + AMD Phenom X3 710 + HD6670
I use dvi connector. Other cards eg. HD2600 PRO, HD3850, HD4850 on some other works without problems with open source drivers. My HD6670 works without problems when I use VESA or Catalyst (on both Linux and Windows platforms) thats why something is wrong with open source driver. Did you see similar issues on your cards? How can I help to fix this issue?