[SOLVED] Problem with DP-port - 1660 Super

[emdege]

I have a problem with my recently purchased Gigabyte GTX 1660 Super which has 3 DisplayPort and 1 HDMI outputs.
I use 2 LG IPS monitors which only have HDMI, DVI and VGA inputs, so with my graphics card I also purchased a DP-HDMI cable to use my second monitor with it.
HDMI port works just fine, the first display connects automatically always, however the GPU struggles to find the second monitor connected with the DP-HDMI cable via the DP port. Whenever I start the computer the second monitor can't find any signal, the PC can't see a second screen. But after random short period of time it starts working and it works as long as I don't turn off the computer or update the driver.
I've tried turning the PC on using just the second screen. It starts with a much lower resolution than the normal 1080p or with no signal at all (it seems it depends on how long was the PC turned off).
My BIOS is up to date, I've tried removing the graphics card and reinstalling it with the latest driver and I also set the power management mode to maximum performance in 3D settings of Nvidia Control Panel.
I couldn't try a regular DP-DP cable as I don't use a DP input monitor.
Any other solution to this? Thank you!

 

[Calvin7]

The DisplayPort uses an LVDS signal protocol that is not compatible with DVI or HDMI.

If the DisplayPort output is a Dual mode DisplayPort then it has the ability to recognize and adjust the signal to HDMI when a passive adapter cable is connected. . If the DisplayPort graphics card is only a single mode DisplayPort then you must use an active adapter or converter.

The P136-000-1 is a passive adapter and requires the connected computer be a Dual Mode DP++ ( Displayport ++ ) source.
https://www.amazon.com/Tripp-Lite-DisplayPort-Adapter-P136-000-1/dp/B00NWRMIEY

Active adapter is also listed on the above page.

 

[emdege]

The DisplayPort uses an LVDS signal protocol that is not compatible with DVI or HDMI.

If the DisplayPort output is a Dual mode DisplayPort then it has the ability to recognize and adjust the signal to HDMI when a passive adapter cable is connected. . If the DisplayPort graphics card is only a single mode DisplayPort then you must use an active adapter or converter.

The P136-000-1 is a passive adapter and requires the connected computer be a Dual Mode DP++ ( Displayport ++ ) source.
https://www.amazon.com/Tripp-Lite-DisplayPort-Adapter-P136-000-1/dp/B00NWRMIEY

Active adapter is also listed on the above page.

So the GTX 1660 Super probably has a single mode DisplayPort as there aren't any ++ signs on it, am I right?
I'm using this cable at the moment: https://www.akyga.com/products/126-cable-hdmi-displayport-ak-av-05-1-8m.html It's probably a passive one, can't tell.