It turns out that the latest radeon firmware is kernel version dependent, at least for late model radeon video cards.
So I have built and re-submitted firmware-radeon extension for kernel-3.17 and newer to tc-7.x x86 & x86_64 repo's; expect it to arrive shortly
A second firmware-radeon extension for kernel-3.16 and older is being prepared and will submitted to tc-6.x x86 & x86_64 repo's asap (while we are still supporting tc-6)
Thanks