Display doesn't work if I don't turn on Monitor before boot

[akajain]

Hi there 

I have a banana pi M1 and I have installed Armbian on it.  The HDMI output / Display work fine if I have HDMI connected to the HDMI port of BPi and monitor/tv is turned on before Armbian booting process starts. However if I don't have HDMI connected before boot process or  Monitor/Tv is not turned on then I don't see the display if I connects the HDMI or turned on Monitor later.

It is a problem for me because when I want to connect to display to already booted OS. Does anyone faced this behavior? Please advise.