HP C8000 hp workstations - hp-ux 11.x graphics administration guide - Page 58

display power management signaling DPMS, Level, State, DPMS Compliance, Requirements, Power, Savings

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configuring X Windows on HP-UX (other graphics cards) display power management signaling (DPMS) display power management signaling (DPMS) Table 3-4 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). Level 0 1 State Screen Saver Standby DPMS Compliance Requirements Not Applicable Optional Power Savings None Minimal Recovery Time Very Short (

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configuring X Windows on HP-UX (other graphics cards)
display power management signaling (DPMS)
Chapter 3
56
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