Lenovo ThinkPad X220
The graphic card is supported by the xf86-video-intel driver package from the extra repository. The Xorg server makes use of this automatically. There's no need for a Xorg configuration file.
pacman -S xf86-video-intel
According to a forum post you should set some power saving options in /etc/modprobe.d/modprobe.conf or add them to your kernel line in your menu.lst.
options i915 modeset=1 options i915 i915_enable_rc6=1 options i915 i915_enable_fbc=1 options i915 lvds_downclock=1
As well you could suffer of Kernel Power Regressions.
- Arch user blogs about the X220
- Thinkwiki X220 reference
- "Arch By Hand" UEFI GPT SSD LUKS Install Script, built on an x220 tablet with an SSD.
- Power saving options for the X220 - Notebook Review Forum