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Type C DP Alt output only works after waking up from sleep


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Hi, I recently bought Type C to HDMI cable and have been playing around with it.

I found that it works perfectly after waking up from sleep, but does not work when I freshly booted.


If I plug in the cable, screen resolution changes immediately, external display recognized, but no signal at the actual external display.

AFAIK, Type C DP alt is recognized as DP, so I did not enable any connector patch for it since it was already configured as DP in the original Framebuffer. (Con2)


CPU: 10210u (UHD 620)

OS: macOS Big Sur 11.5.1

Bootloader: OC 0.7.2

WEG: 1.5.2


Here is the SSDT-PNLF I edited to fit my laptop display.



Any patch I need to apply for it to work? Thanks.

Edited by Nix_SH
Added SSDT file
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