User's Guide
Page 45
You will see the following message appears: Recommended mode is disabled: When the monitor enters the Power Save mode, the following message before the DDC/CI function 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). This means that the monitor cannot synchronize with the signal that it is receiving from the computer.
You will see the following message appears: Recommended mode is disabled: When the monitor enters the Power Save mode, the following message before the DDC/CI function 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). This means that the monitor cannot synchronize with the signal that it is receiving from the computer.