Solved! Samsung TV (MU7000) shows highest resolution (3840x1440) but cant change to 2560x1440

Jan 24, 2019
In the windows settings (windows 10) when I change to any resolution above 1920x1080 it will show in the "active resolution signal" 3840x2160 and in the desktop resolution it will show the resolution you chose. however on my tv the resolution will also stick to the same resolution as the active resolution signal. By the way my tv is 4k I tried everything my tv resolution just wont change to anything between 1920x1080 to 3840x2160. Please help thanks.
It sounds like your TV is automatically upsampling or stretching the incoming picture. You may have a setting in the TV to change this behavior.