About This File
These are the kexts for ATI Mobility Radeon HD 550v/4650 (1002_9480), taken from OS X 10.11.x. Edited by me, works also HDMI & VGA output.
Thanks bcc9 & crazybirdy - http://www.insanelym...al-lvds-screen/
Delete only AMD4600Controller.kext.
Install these two kexts with kext utility or others kext installer.