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HDMI and Built In display doesnt work together

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My laptop is dell inspiron 3421 




intel core-i3,intel HD 4000 with HDMI output.

bootloader is chameleon.


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.


I have followed same steps used for previous installation and had no issues in using second monitor with laptop.


i thought issue may be with my HDMI to VGA converter, but when i tried on seperate windows installation , it works perfect!.


what can i do to fix issue?

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