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

X Server configuration

Chapter 222

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 X*screens file entry before starting the server:

MinimumMonitorPowerSaveLevel <level>

where level is replaced with the single digit 0, 1, 2, or 3 as specified in the

Level column in the above table.

shared memory extension (MIT_SHM)

The MIT shared memory extension provides both shared-memory

XImages and shared-memory pixmaps based on the SYSV shared

memory primitives.

Shared memory XImages are essentially a version of the XImage

interface where the actual image data is stored in a shared memory

segment, and thus need not be moved through the Xlib interprocess

communication channel. For large images, use of this facility can result

in increased performance.

Shared memory pixmaps are a similar concept implemented for the

pixmap interface. Shared memory pixmaps are two-dimensional arrays

of pixels in a format specified by the X Server, where the pixmap data is

Table 2-1 Power saving states defined by VESA

Level State

DPMS Compliance

Requirements

Power

Savings

Recovery Time

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

1 Stand-by 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 24