Second Display Port not working after boot, when Display is off.

[SlavoR]

I have a problem with second display port. When I boot my PC  with second display connected, but switched off, second display port is not working. Even if I connect, reconnect video cable.

Primary display, connected to first display port is working properly.

But when I boot my PC with both displays swithed on, it started to boot ok and everythink is ok.

I can see boot info on both displays and also in windows it's working properly.

I think, problem should be in driver or in bios.

It started few months ago, I think, after some MS updates were installed.

Now, I have all drivers up to date, also installed last bios.

Video Card is Intel UHD 630.

Thanks for any helpfull ideas.

[Purecut]

HI,

I do not know in other ways. I have several workstations with 2, 3 and 4 monitors connected and during boot I only see the boot sequence on the main monitor. When I login into windows than the other monitors are switched on like I adjust them. But during boot up and also the MS Windows login screen always shown only on the main monitor. I have never seen than the boot-up sequence are shown on all connected monitors.