Intel HD Graphics
A very recent Linux distribution with kernel 2.6.33 and Intel Xorg driver 2.11 or newer is recommended.
Note that XVideo (Xv) playback at certain frame sizes does not work properly unless you have at least version 2.12 of the Intel Xorg driver.
Desktop Effects do not work in Ubuntu 10.10 (at least, on an X220).
The BIOS for the T420s (and presumably also the T420) settings for _Graphics Device_ default to NVIDIA Optimus and the OS Detection for NVIDIA Optimus is set to Disabled which is not a good set of defaults for Linux since Optimus is only supported by Windows 7. To get the NVidia drivers working for Linux I had to set the Graphics Device to Discrete Graphics. This was as of 2011-11-26 using driver version 290.10. Then run sudo nvidia-xconfig. Both TwinView and Xinerama worked fine.
Models featuring this Technology
- ThinkPad Edge 11", Edge 14", Edge 15"
- ThinkPad L412, L512
- ThinkPad T410, T410i, T410s, T410si, T420, T420s, T510, T510i
- ThinkPad X201, X201i, X201s, X201 Tablet, X220