Double press of "Services" key. Press 1 (for Preferences) then 1 (for Display Settings). Press down nav key to highlight "Backlight" and then left/right nav key to adjust. Press "Apply" softkey to set it.
Services" key is the hard key on the left of the navigation pad in the middle on the IP Phone 1120E/1140E. If your phone does not have English key labels then it looks a globe.
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