Support is now out for radeon hd6000 (BARTS/CAICOS/TURKS only) and the ucode files from http://people.freedesktop.org/~agd5f/radeon_ucode/ need to be added to UCODE_FILES in the ebuild. Reproducible: Always
List of new ucode files to be added: BARTS_mc.bin BARTS_me.bin BARTS_pfp.bin BTC_rlc.bin CAICOS_mc.bin CAICOS_me.bin CAICOS_pfp.bin TURKS_mc.bin TURKS_me.bin TURKS_pfp.bin
Fixed in CVS.