Asus Eee PC 1225b

Graphics with open-source radeon drivers
All the necessary firmware is provided with x11-drivers/radeon-ucode package (it is easy to emerge within a chrooted environment):

Kernel parameters are well described in the article about Radeon. However the choice of firmware isn't that obvious. As it is supposed here, APU is usually detected as PALM, while in fact it is closer to SUMO. The only way out is to compile them both into kernel:

This lets kernel modesetting work properly.