We had the opportunity to try out Photoshop CS6 on an AMD A300-equipped system at SIGGRAPH. These brief videos should give you some idea of the performance of the AMD A300 APU. These machines had no discrete graphics in them and both demos are of the same machine.
These APUs should, as seen above, be able to provide fair performance under OpenGL and OpenCL, at least acceptable for light GPU-accelerated graphics work.
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PS these onboard GPU's are just as fast as some of the videoocards that people were happy with a few years ago with photoshop so there is no doubt that it handles photoshop really well. The only issue is can it handle a modern workload involving many high resolution images.
That post caused my brain to bluescreen and reboot.
Actually, I get where OP is coming from. Doing "light" work means that I'm probably not a professional and can't pay for an expensive-ass piece of software like photoshop.