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multiple monitor output not working , either HDMI or inbuilt display

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My laptop is dell inspiron 3421 




intel core-i3


intel HD 4000 with HDMI output.


bootloader is chameleon.


SMBios MacBookPro 9,2














Every thing except Wifi used to work before reinstallation.


Now HDMI out put have issue after reinstallation.


I can only use one display output at a time,


either HDMI or laptop display.


what can i do to fix issue?



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