I created a thread on amd's developer forum. I can see other have the same problem, so I believe it will get fixed.
Sounds good. There's nothing like running it on a supported configuration and still having a problem to get the developers attention :D
I still get the device unsupported, but opencl works. :-)
Though for some of the samples I get:
Error: Device does not support sub 32bit writes!
Well maybe my card just doesn't support 23bit writes.