Lenovo ThinkPad x120e

The x120e is one of the first netbooks boasting the AMD Fusion-Zecate APU with similar hardware to the HP dm1z.

E-350 Processor Details
cat /proc/cpuinfo

lspci
lspci

Kernel
I've had the best luck with the git-sources for now >=2.6.38_rc7, which you may need to unmask.

Choose a graphics driver from those available for your card and follow the linked guide.

Firmware
As of 23 May 2012 (and using newest packages available), the above will cause boot to fail. Below is the appropriate firmware config options, from http://wiki.gentoo.org/wiki/Radeon#Firmware

Audio
For ALSA to output sound through the laptop speakers by default: