As it was first and last seen in the X1 Carbon G2, the Adaptive Keyboard is technically a 5-row keyboard with a touch-sensitive strip occupying 6th row (generally dedicated to function keys in other models). The touch-sensitive strip has four known modes of operation:
- Web Browser
- Web Conference
To change the mode of operation, the touch-sensitive 'button' at the top left corner of the adaptive row has to be pressed.
See this link from Arch Linux's wikipedia for more information regarding the adaptive row of this keyboard. Note that Linux kernels older than 3.15 will force the adaptive row to be locked to Function mode. There might be unofficial workarounds for this problem, however.
Models featuring this technology