Wow, thank you for this quick reply! Here's what i've done now. Please correct me, if I've done something wrong. //Removing the old ucode. -rm /usr/lib/firmware/radeon/hawaii* -rm /usr/lib/firmware/radeon/HAWAII* Then I downloaded all 11 files from the link and moved them to /usr/lib/firmware/radeon/. Finally I executed 'sudo dracut -f' to generate a new initramfs. Sadly it doesn't change the behavior. I still get a freeze/black screen. :-(