Samsung Refresh Rate changing on non native resolution

Arif_Sohaib

Honorable
Nov 15, 2013
3
0
10,510
I bought a Samsung T22B300 about a year ago. The TV is fine and works well enough as a monitor, aside from some lightning issues.
But sometimes I need to set the resolution lower than 1080p and it automatically changes the refresh rate but keeps the resolution at 1920*1080, scaling up the image to the display. This produces a very bad image particularly in games.
However this issue is not present when I connect to VGA input. In this mode, the resolution I set is the one on screen. But being VGA, it looks much worse than HDMI and can't go back to the monitor's native 1920*1080.
Is there any way to stop it from changing the resolution?
 

Arif_Sohaib

Honorable
Nov 15, 2013
3
0
10,510

My GPU is HD 7750 and CPU is Core2Duo E7300. This combination can easily handle 720p but has difficulty with 1080p.
Every time I set a game's resolution to 720p, the monitor scales it to 1080i instead. Strangely it does not happen in all games.
In Injustice, it remains 720p. In Arkham Origins, it turns into 1080i.