LG 27UK600 wake from sleep issue using HDMI

[avxkim]

When i put my mac mini (2018) in to sleep, then after 30 seconds i press any key again, it wakes up instantly. But if i put my mac in to sleep, then wait like 10 or more minutes, when i press any key to awaken it, it firstly turns out, then shows "no signal" message, then goes black again, only after like 40 seconds it shows the picture. Though my mac is awaken instantly, because i can type my password in the first seconds when i awaken it.

I'm forced to use HDMI because my existing usb-c -> displayport cable is not fitting usb-c ports on my mac mini (i've ordered that cable from aliexpress, guess it's problem with a cable itself, though it worked with my macbook pro 13" 2017 and i had no issues when it was using usb-c -> displayport)

Is it monitor or mac mini itself?

 

[avxkim]

My current workaround is:

1. Put mac in to sleep
2. Turn off monitor, by pressing the power button on it

When i'm ready to work again:

1. I press any key on the keyboard
2. Turning on the monitor, by pressing power button.

And monitor shows the picture instantly. It's just something wrong with the signal that mac is sending to the monitor via hdmi.