![Dallas Warren on Twitter: "Attempting to use external monitor with laptop (Dell M4800). Fn+F8 shows "No External Display", finally found ref "disable Optimus in BIOS", after disappearing down rabbit hole with others. Dallas Warren on Twitter: "Attempting to use external monitor with laptop (Dell M4800). Fn+F8 shows "No External Display", finally found ref "disable Optimus in BIOS", after disappearing down rabbit hole with others.](https://pbs.twimg.com/media/Dibmb5xUEAAxfom.jpg:large)
Dallas Warren on Twitter: "Attempting to use external monitor with laptop (Dell M4800). Fn+F8 shows "No External Display", finally found ref "disable Optimus in BIOS", after disappearing down rabbit hole with others.
![Precision Mobile Workstations M4800/M6800 will not clone displays with Switchable Graphics enabled | Dell US Precision Mobile Workstations M4800/M6800 will not clone displays with Switchable Graphics enabled | Dell US](https://supportkb.dell.com/img/ka02R0000008McdQAE/ka02R0000008McdQAE_en_US_2.jpeg)
Precision Mobile Workstations M4800/M6800 will not clone displays with Switchable Graphics enabled | Dell US
![External Display Feature on Precision M4800 with E-Port/E-Port Plus Docking Solution | Dell Dominica External Display Feature on Precision M4800 with E-Port/E-Port Plus Docking Solution | Dell Dominica](https://supportkb.dell.com/img/ka02R000000i1WfQAI/ka02R000000i1WfQAI_en_US_1.jpeg)
External Display Feature on Precision M4800 with E-Port/E-Port Plus Docking Solution | Dell Dominica
Solved: Precision M4800 : Input lag at log in, Switchable graphics not functioning, GPU fan "chirping" when ... - Page 5 - Dell Community
Solved: Precision M4800 : Input lag at log in, Switchable graphics not functioning, GPU fan "chirping" when ... - Dell Community
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