about your vga trouble with driver , may be you should add an options file in the etc/modprobe.d with some settings .
i have a hvr2200 that is a tvcard , kernel did the same as for you , asked for the firmware file-name but i also had to add the option file with parameters for the driver
First you need to install the ATI Stream SDK and if not, you can find the installed
Also your GPU doesn't support OpenCL, so you will get only the CPU OpenCL device, without much performance improvement.
you need to have libOpenCL.so in /usr/lib/ as your card doesn't support OpenCL and this library is included in both the ATI Stream SDK (for ATI users) and the NVIDIA GPU Computing SDK .