Stretched display on 21:9 monitor

[Annkako]

Hello,

I just connected a 21:9 monitor to my HP notebook and set the resolution to recommended 2560x1080. Unfortunately, the display is streched and there are black stripes at the top and bottom (the display is flattened). My HP laptot is a few good years old, and when I connected the monitor to newer laptop the screen was OK. Thus, I assumed I needed to update drivers but it didn't work. Could you help?

[Huffer]

Ultrawide aspect ratio is likely not supported by the HDMI port. 

[Annkako]

Do you mean that it is not supported by the HDMI port for old laptops? Because, as I wrote, I connected it to a new laptop by exactly the same HDMI cable (no adapter, directly from monitor to laptop) and the display was perfect. However, with the 5 year old laptop the display is streched.

[Huffer]

Yes that is what I mean. That monitor aspect ratio was not common at the time the computer was made. There may be ways to force a different aspect ratio through the video control app in some cases e.g. nVidia or Intel video control panel. I had an ultrawide monitor a few years back and it was hit and miss if different computers would work right with it. 

[Annkako]

Thank you for information. I will try to connect it through display port with some adapter. Maybe that'll work.