Monitor connected with HDMI to laptop goes black

[javidang]

Hi. If I connect second monitor to my laptop and work "on it" everything is ok. But if I just switch working to monitor of laptop, second monitor starts to go black often for 1-2seconds. I don't think It is HDMI port failure, and second monitor is ok, i tested it, HDMI cable is also ok. I choose extend monitor in settings. But again problem starts when I try to use my main monitor (monitor of laptop)

 

[TMTOWTSAC]

In your display settings, do you have it set to display the desktop only on 1 monitor? Also, is there a separate display sleep setting for the external monitor?

 

[javidang]

In your display settings, do you have it set to display the desktop only on 1 monitor? Also, is there a separate display sleep setting for the external monitor?

I set it to extend display, and it works well. There is no separate display settings for external display.

 

[TMTOWTSAC]

Hrm. Does your laptop have both a [strike]dedicated[/strike] discrete GPU and an integrated GPU?