I'm running Ubuntu 8.4. The GPU is HD3690 with fglrx 8.501 (ATI Catalyst 8.6), and the sdk is v1.1-beta.
Firstly, I encountered "Locking assertion failure" error with the brook+ sample. I solved it by installing noxcb lib from http://people.ubuntu.com/~bryce/Testing/libx11/. Then, I'm running hello_brook sample successfully.
Howerver, the simple_matmult sample hangs and I must reset the pc. When I set BRT_RUNTIME=cpu, it's running correctly.