How do monitors know when to enter power saving modes?
(Portions from Bob Myers (myers@fc.hp.com)). If the monitor complies with the VESA DPMS (Display Power Management Signalling) standard, it will go into power saving modes when either horizontal or vertical sync is disabled. Different combinations of the sync signals indicate different levels of power management, distinguished by how much the power is reduced and the expected recovery time. The greater the power savings, the greater the recovery time is expected to be. For instance, one thing that may distinguish the greater power savings states is turning off the CRT filament, something that you don’t recover from in just a second or two. You can tell which power saving mode is active by how long the monitor takes to come back to life: 1. Video blanking – image will appear instantly when any key is pressed since this is just a logic level inhibiting the video drivers. 2. Full shutdown – a warmup period of around 15 seconds will be needed for the image to reappear since the filaments of
(Portions from Bob Myers (myers@fc.hp.com).) If the monitor complies with the VESA DPMS (Display Power Management Signalling) standard, it will go into power saving modes when either horizontal or vertical sync is disabled. Different combinations of the sync signals indicate different levels of power management, distinguished by how much the power is reduced and the expected recovery time. The greater the power savings, the greater the recovery time is expected to be. For instance, one thing that may distinguish the greater power savings states is turning off the CRT filament, something that you don’t recover from in just a second or two. You can tell which power saving mode is active by how long the monitor takes to come back to life: • Video blanking – image will appear instantly when any key is pressed since this is just a logic level inhibiting the video drivers. • Full shutdown – a warmup period of around 15 seconds will be needed for the image to reappear since the filaments of t
