ASUS Eee PC 1215n
This page includes general information regarding Asus EEE PC 1215n and related notes on installing/using Arch Linux on it.
CPU: Intel Atom D525 1.83GHz 667 MHz CPU, 1MB L2 Cache
RAM: 2GB 1066MHz DDR3
HDD: 250GB 5400RPM
GPU: nVidia ION2 with Optimus (see below)
Display: 12.1" 1366x768 LED display
Card Reader: TODO
nVidia ION 2 with Optimus
nVidia Optimus is basically a software configuration that utilizes an Intel IGP + an nVidia GPU that writes to the Intel IGP's framebuffer. This is all done on the software side. The nVidia GPU is not wired to the outputs (VGA, HDMI etc.) At the time of this writing (September 27, 2010) Optimus on Linux sucks (i.e. doesn't work at all). You can still use the Intel IGP, but there is no way to access the discrete GPU. DO NOT try to install the nVidia binary driver, you have been warned.
Things are not that bad however. There is a kernel module called "acpi_call" which enables you to power off the nVidia GPU, hence you can significantly improve battery life.
David Airlie seems to be working on PRIME support (google it) but there is nothing that works for now.