Install Ubuntu 8.10 (Intrepid Ibex) on a ThinkPad T400

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Before Installation

Before you can start Ubuntu from CD or USB you have to change two BIOS settings:

Change to Internal or ATI Graphics with Config --> Display --> Graphics Device --> [Integrated graphics] or [Discrete Graphics]
Disable OS Detection for Switchable Graphics. Otherwise it will mysteriously switch back to Switchable Graphics.

Now you can boot you Live-CD, connect to Wireless Lan, and install the OS.

Wireless (Intel 5300 ABGN)
- Only tested G mode yet
Gigabit Lan
Touchpoint and Trackpad
- Including scroll at the right side of the pad by default.
Optical drive
- Not tested burning yet
Sound card
- To use your internal microphone you have to change to HDA Intel CONEXANT Analog (ALSA) in audio-settings.
SD/MMC Memory card reader (Ricoh)
- Only tested SD cards.
Control buttons/Hotkeys
- Volume control buttons
- Screen brightness control (but changing Brightness is a little bit diffuse. It's getting brighter but on maximum it changes to nearly lowest and get brighter again.)
- Thinklight control
- WLAN/BT/OFF toggle (Fn+F5 and mechanical toogle)
- Media player control
Some ACPI features
- Battery status, power graphs and history (tested with an single 6-Cell battery)
- Lid states and events

Edit the file /usr/share/hotkey-setup/ibm.hk with adding this line:

setkeycodes e017 148 #thinkpad button

You have to restart, then you can add a command with the keyboard shortcuts menu.

Neither Suspend nor Hibernate work for me. They fell asleep, but waking up nearly never works. Maybe it works once... but i can't remember.

Theres a new chipset build in, the "AuthenTec AES2810". So neither the thinkfinger nor the fprint Project support this Device at the moment.

lsusb
cmduser| Bus 002 Device 004: ID 08ff:2810 AuthenTec, Inc.