https://bugs.freedesktop.org/show_bug.cgi?id=76490
--- Comment #20 from dex+fdobugzilla@dragonslave.de --- I can confirm: drm-next-3.17-wip + new ucode doesn't make any difference.
Testscenario:
* Built/Installed new kernel, copied new ucode into /lib/firmware * Built new initrd * reboot with "nomodeset" and gfxpayload=text into multi user runlevel * modprobe radeon drm=1 modeset=1
Monitor went black (but shows connected DVI), system is unresponsive.