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Dell-Precision-5510-OSX

HDMI

Inorder for hdmi to be able to output, you should add

				<key>Mac-A5C67F76ED83108C</key>
				<string>none</string>

under ConfigMap->dict in /System/Library/Extensions/AppleGraphicsControl.kext/Contents/PlugIns/AppleGraphicsDevicePolicy.kext/Contents/Info.plist
and rebuild kext cache using sudo kextcache -i /

Better guide

Thank for @timrijckaert we have a more detail guide