Resolution dropdown shows same resolutions

Hi
I made this script using tutorial. It works well in the Editor, but when I build my game, resolution in dropdown are multiple. For example, there are four 1920x1080 etc. What's the problem?

Code (CSharp):

1. public Dropdown dropdownMenu;
2. void Start()
3.     {
4.  
5.         resolutions = Screen.resolutions;
6.         dropdownMenu.onValueChanged.AddListener(delegate { Screen.SetResolution(resolutions[dropdownMenu.value].width, resolutions[dropdownMenu.value].height, Screen.fullScreen); });
7.         for (int i = 0; i < resolutions.Length; i++)
8.         {
9.             dropdownMenu.options[i].text = ResToString(resolutions[i]);
10.             dropdownMenu.value = i;
11.             dropdownMenu.options.Add(new Dropdown.OptionData(dropdownMenu.options[i].text));
12.  
13.         }
14.     }
15.  
16.     string ResToString(Resolution res)
17.     {
18.         return res.width + " x " + res.height;
19.     }

 

Take a look at the Resolution class in the documentation. You've got width and height, of course, but you also have refresh rate. I guarantee you that the four 1920x1080's all have different refresh rates.

 

Yeah, that's it. But why does 1920x1080 has twice 60 Hz? And why there are resolutions that have one or two refresh rates?

 

The information comes from your monitor, so we can only speculate what your monitor is returning. It might support two different refresh rates both very close to 60 Hz that are both rounded to the same number. It might actually be returning the same resolution/refresh twice and Unity is just passing that on through. As for why some resolutions have more than one refresh rate and others only have one, that just comes down to the hardware capabilities of your specific monitor.

You probably will want to implement your own filtering of the list if this bothers you. I'd expect some super cheap monitors may return even more silly of results.