Lenovo ThinkPad T400

(Introductory paragraph goes here. Describe the hardware. It is okay to mention the hardware platforms friendliness to open source drivers. Optionally, it is nice provide a nice summary of why or why not a user would want to buy this hardware for use with Linux.)

Accessories
(Optional section. Describe any accessories that may be possible in this section. Anything from external plug-and-play LCD screens to computer docks.)

Installation
(Write the necessary steps to get Gentoo onto this system. Try to document any special step that each user will need to reproduce on their system. Includes getting special drivers or firmware from a manufacturer website, etc.)

Kernel
(Show what options are necessary in the kernel in order to get all device components functional for this hardware platform.)

Emerge
(Optional section. If the platform requires any user space packages or kernel patches, mention them here).

Configuration
(Explain any additional configuration or special customization for this hardware platform. Could be anything from BIOS settings to assigning proper media key functionality.)

External resources

 * https://support.lenovo.com/us/en/documents/pd005598
 * https://wiki.archlinux.org/index.php/Lenovo_ThinkPad_T400s