XF86Setup
: Configuration areas
: ModeselectUse this one to pick which depth you prefer to use (this determines how many colors can be displayed at a time) and to select all of the modes you are interested in possibly using.
Your hardware may not be able to support all of depth and mode combinations that can be selected. Any unsupported combinations will automatically be rejected by the server when it tries to startup. Note also that if you select multiple modes, you will get a virtual screen as large as the largest of the usable modes.
XF86Setup
: Configuration areas
: Modeselect