I have installed Ubuntu 19.10 side by side (in dual boot) with Windows 10. Everything works perfectly, except for dual monitor setup. When I connect my AOC 32" monitor with HDMI cable that has optimal resolution of 2560×1440, there is no image on that monitor. If I lower the resolution to 1920×1080 and then the monitor works, but everything is blurry and too big. On Windows everything is working alright, so this is not a hardware issue.
I've tried playing with the display refresh rate, because I read somewhere that that resolution (2560×1440) only works with 30 Hz refresh rate, but I am not able to select 30 Hz on that monitor in display settings. It only allows me to select some strange decimal number refresh rates, e.g. 63.67 and 75.23. But none of that works.
My computer is laptop Toshiba Satellite P50-C. There are two graphic cards inside, Intel's integrated graphics and nVidia GeForce GTX 950m. I have already searched for solutions online, but I didn't manage to make it work. When I open Ubuntu About app there it says that GeForce is the video card that is used by Ubuntu.
Also, I've updated to the latest nVidia proprietary drivers and I've tried different drivers (different versions), but with no result. I would really like to switch fully to Ubuntu but this is a deal-breaker for me.
What else can I try?