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Thanks for your suggestion. That makes a lot of sense. Recently I just tried OpenCore, followed all the instructions, and I believe I got everything to the state that it should be but still get this issue. I need to turn off and on the monitor to get the audio back. And without igfxonln=1, I can...

I have the same issue. igfxonln=1 can bring up the video but not audio. I need to turn off and on the monitor to get the audio back. And without igfxonln=1, I can also bring both the video and audio back by turning off and on the monitor. It seems igfxonln=1 only works for video signal but not...

Hi @manny_c, appreciate that fixed the HDMI loses signal problem. However, it seems that adding the igfxonln=1 flag causes the HDMI device option missing in the audio output devices list. Any idea?

This post might fix your problem. It fixed mine. https://www.tonymacx86.com/threads/uhd-620-loses-hdmi-signal-on-catalina-login-screen.297577/

Thanks so much. The first was already done and I added the second: igfxonln=1 which fixed my problem. Really appreciate!

It was working well on Mojave. Then after upgraded to Catalina, I got this issue. Right after the OS is booted and the login screen is loaded, the screen turns black. If I then switch the monitor signal source to others e.g. VGA/Display then switch back to HDMI, the screen is back to normal and...

@RehabMan The the post (and the successor post) both said BCM94352 5GHz Wifi only supports 10.13. Is there any way to make it work on 10.14 Mojave? Thanks in advance.

Is there still any way to let bcm94352 Wifi 5Ghz work on 10.14? @toleda Just want the BT to not interfere with 2.4G Wifi. Otherwise, it's stuttering badly. Thanks in advance.