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[Problem] Black primary screen on laptop when booting with HDMI

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Joined
Oct 11, 2017
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Motherboard
Lenovo 510s-14isk (OpenCore UEFI)
CPU
i5-6257u
Graphics
Iris 550, 1920x1080
Hello everyone,
I have a problem when booting my laptop (Lenovo 510s: https://www.tonymacx86.com/threads/guide-lenovo-510s-14-isk-using-clover-uefi.282660/) being connected to HDMI. The primary screen is black (but still recognized because the cursor can go on the primary screen), the secondary screen connected via HDMI works properly.
To solve this issue the only way for me is to: detach HDMI cable, go to sleep, wake the screen, reconnect the HDMI cable.
I have followed this guide to patch the framebuffer: General Framebuffer Patching Guide.
Any help is appreciated.
 

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