Article Number: 000140274
Follow the guidelines below to resolve an issue with the Precision Mobile Workstations M4800/M6800 not cloning displays with Switchable Graphics enabled/ can't recognized graphics card after replace montherboard.
Precision Mobile Workstation M4800/M6800 system clone mode was not selectable for connected displays. User was able to extend graphics across all screens connected, but could not clone any displays.
The system is working within the design specification.
These systems are equipped with Switchable graphics that allows the basic graphics adapter (Intel Integrated Graphics) to be the default graphics of the system. In this configuration, the high performance graphics card supported the external display.
To disable Switchable Graphics in the BIOS see Figure 1.
Figure 1. - Unchecking the Enable Switchable Graphics Option in the BIOS
The clone option is disabled when switchable graphics is enabled in the BIOS. If clone mode is required, then switchable graphics must be disabled.
Precision M4800, Precision M6800
05 Dec 2020