Lenovo ThinkVision L171p - Manual (Page 15)

To use the controls:
1. Press to open the main OSD menu.
2. Use or to move among the icons. Select an icon and press to access that
function. If there is a sub-menu, you can move between options using or ,
then press to select that function. Use or to make adjustments. Press to
save.
3. Press to move backwards through the sub-menus and exit from the OSD.
4. Press and hold for 10 seconds to lock the OSD. This will prevent accidental
adjustments to the OSD. Press and hold for 10 seconds to unlock the OSD and
allow adjustments to the OSD.
Chapter 2. Adjusting and using your monitor 2-4