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<< Solved >> UHD 620 loses HDMI signal on Catalina login screen
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...