Solved: Precision M4800 : Input lag at log in, Switchable graphics not functioning, GPU fan "chirping" when ... - Dell Community
Solved: Precision M4800 : Input lag at log in, Switchable graphics not functioning, GPU fan "chirping" when ... - Dell Community
Solved: Precision M4800 : Input lag at log in, Switchable graphics not functioning, GPU fan "chirping" when ... - Page 5 - Dell Community
![Dallas Warren på 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 på 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)