LG 27HK510S Owner's Manual page 26

[All Settings] > [Picture]
[Resolution] A user can set the desired resolution. This option is available only when the screen resolution of the computer is set as below (only for the D-SUB).
NOTE
• When the resolution selected by a user is different from the resolution outputted by the PC per computer, the function will be deactivated.
[1024 x 768], [1280 x 768], [1360 x 768], [1366 x 768], [Off]
[1280 x 960], [1600 x 900], [Off]
[1440 x 900], [1600 x 900], [Off]
[Picture Reset] Returns colour to the default settings.
26
Explanation