https://bugs.freedesktop.org/show_bug.cgi?id=77835
--- Comment #4 from Maik Broemme mbroemme@libmpq.org --- Alex, I've tried 3.15-rc2 and your new ucode files from http://people.freedesktop.org/~agd5f/radeon_ucode/ for both cards now, but still no luck with xrandr and both cards. Firmware is correctly loaded. Same crash.
[ 21.174824] [drm] initializing kernel modesetting (HAWAII 0x1002:0x67B0 0x174B:0xE285). [ 21.436057] [drm] Loading HAWAII Microcode [ 21.442757] [drm] radeon/HAWAII_mc2.bin: 32364 bytes [ 21.698816] [drm] initializing kernel modesetting (PITCAIRN 0x1002:0x6818 0x1682:0x3251). [ 21.699439] [drm] Loading PITCAIRN Microcode [ 21.701027] [drm] radeon/PITCAIRN_mc2.bin: 31100 bytes