Xvesa

From DSL Wiki

Xvesa is a generic X server for Linux on the x86 platform. Xvesa doesn't know about any particular hardware, and sets the video mode by running the video BIOS in VM86 mode. Xvesa can use both standard VGA BIOS modes and any modes advertised by a VESA BIOS if available.

Go here for further info on Xvesa.