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.
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Solved: Precision M4800 : Input lag at log in, Switchable graphics not functioning, GPU fan "chirping" when ... - Dell Community
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Solved: Precision M4800 : Input lag at log in, Switchable graphics not functioning, GPU fan "chirping" when ... - Page 5 - Dell Community
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Solved: Precision M4800 : Input lag at log in, Switchable graphics not functioning, GPU fan "chirping" when ... - Dell Community
Solved: Dell M4600 Intel Turbo Boost Technology Driver - Dell Community
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