@Christopher M. Just want to add that AMD APP SDK (http://developer.amd.com/tools/hc/AMDAPPSDK/Pages/default.aspx) cannot use GPU as OpenCL device if open source video driver is used. In Ubuntu 11.10 I use proprietary AMD driver and APP SDK detects two OpenCL devices - CPU and GPU. In 12.10 with open source driver only CPU device is detected.
@Christopher M. Just want to add that AMD APP SDK (http:// developer. amd.com/ tools/hc/ AMDAPPSDK/ Pages/default. aspx) cannot use GPU as OpenCL device if open source video driver is used. In Ubuntu 11.10 I use proprietary AMD driver and APP SDK detects two OpenCL devices - CPU and GPU. In 12.10 with open source driver only CPU device is detected.