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configuring X Windows on HP-UX (other graphics cards)

display power management signaling (DPMS)

Chapter 356

display power management signaling (DPMS)

Monitors constitute a large percentage of the power used by a

workstation even when not actively in use (i.e. during screen blanking).

In order to reduce the power consumption, the Video Electronic

Standards Association (VESA) has defined a Display Power Management

Signaling (DPMS) standard which can be used to greatly reduce the

amount of power being used by a monitor during screen blanking.

The following table is a description of the states that are defined by

VESA. The Power Savings column indicates (roughly) the level of power

savings achieved in the given state. The Recovery Time is the amount of

time that the screen takes to return to a usable state when the screen

saver is turned off (by pressing a key or the moving the mouse).

The actual amount of power saved and the recovery time for each of the

states is monitor dependent and may vary widely. The customer can

compensate for this by choosing an appropriate level for the monitor that

is currently in use.

By default, the DPMS level used is the Screen Saver (i.e. no power

savings). If you wish to use power saving during screen blanking, set the

following XF86Config file entries before starting the server: blank time,

standby time, suspend time, and off time.

The DPMS Extension lets individual users customize their personal

DPMS settings to meet their work styles and any restrictions imposed by

their employers. For example, an employer may decide that all monitors

must save power after 30 minutes of idle time. The individual user may

decide that 30 minutes is too long, and adjust the time downward to meet

their work preference.

Table 3-4

Level State DPMS Compliance

Requirements

Power

Savings

Recovery Time

0 Screen Saver Not Applicable None Very Short (<1 sec)

1 Standby Optional Minimal Short

2 Suspend Mandatory Substantial Longer

3 Off Mandatory Maximum System Dependent

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HP c8000 Workstation Guia do Utilizador Página 58