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I have Dell Latitude E6420 with Dell E-Port Replicator PRO3X (on the picture at the bottom).
I have two Lenovo L24q-10 monitors with maximum resolution of 2560x1440 (QHD).
One display (main) is connected via Display Port (DP) cable, other is connected in two similar ways over DVI-D (Dual Link) port: either DVI-D cable to DP, or DVI-D adapter to HDMI. HDMI supports QHD.
However, after PC boot, the second monitor stays in stand-by mode. If the resolution is set to the 1080p (1920x1080), it works normally.
Windows didn't offer higher resolution, but I have added QHD via Nvidia Control Panel (after drivers update, second monitor appeared normally).
I have found a way to turn it on: go to Screen Resolution (Control Panel\All Control Panel Items\Display\Screen Resolution) on the second monitor,
change resolution to 1600x900, click to the button "Apply", and after Windows asks to keep this settings, I click to the "Revert".
After that, second monitor turns on and stays active until reboot.
My question is: why this is happening? Why the second monitor goes to the stand-by mode after PC booting?
I have the latest BIOS update (A25) and latest drivers from Dell site.
I saw that article. But it is working for me (currently I am using both in QHD). However, I must "wake up" the second monitor after every PC (re)start, and that is a problem. – Aleksandar – 2019-03-27T13:07:55.090