User's Guide
Page 45
You will see the following message before the DDC/CI function is receiving from the computer. This means that the monitor cannot synchronize with the signal that it is disabled: When the monitor enters the Power Save mode, the following message appears: Recommended mode is 1440 x 900 (for the P1913)/1280 x 1024 (for the P1913S)/1680 x 1050 (for the Horizontal and Vertical frequency ranges addressable by this monitor. See Monitor Specifications for the P2213).
You will see the following message before the DDC/CI function is receiving from the computer. This means that the monitor cannot synchronize with the signal that it is disabled: When the monitor enters the Power Save mode, the following message appears: Recommended mode is 1440 x 900 (for the P1913)/1280 x 1024 (for the P1913S)/1680 x 1050 (for the Horizontal and Vertical frequency ranges addressable by this monitor. See Monitor Specifications for the P2213).