IBM T221 - Manual (Page 21)

Chapter 3. Adjusting and maintaining your monitor 15
3. Press the Left-Arrow button for at least 3 seconds to disable or
enable the color management mode when a single video input is
being used
4. Press the Menu/Enter button to exit from this submenu.
Note: * The monitor automatically detects the number of video inputs and
timings. The OSD doesn't provide a manual override.
Information submenu
1. Select
the Information icon on the Main menu using the Left-Arrow
or the Right-Arrow button, to check the vertical frequency and the
resolution of your monitor
2. Press the Menu/Enter button. The Information submenu appears.
3. Press
the Menu/Enter button to exit from this submenu.