How is TWIN display different from CLONE display?
TWIN display is a display configuration in which two displays are driven by the same set of timings. Both display devices should support those timings (resolution, refresh etc), where CLONE display is a display configuration in which 2 displays can have a different set of timings; that is, each display can have different timings. The Intel Embedded Graphics Drivers support both TWIN and CLONE modes. See the Intel Embedded Graphics Drivers User’s Guide for more information.