OK, finally problem solved with the DP cable. Thank you for everyone helping me.
I recently purchased the Inspiron 3020 and connect it to my Acer EB321 WQHD monitor. But the new Dell 3020 can only display up to 2048x1152 and not 2056x1440. Only when I use the display card from my old computer then it can display 2056x1440. I have another pc which is 4 years old also with Windows 11 can display the native resolution properly. No issue at all. I installed all the possible driver from Dell, Intel and acer. I move the monitor to another Dell PC 3090 which have Intel 730 chip and is the same. Can only display 2048x1152. Why? Peter
Inspiron 3020, cannot display proper/native resolution