HP b2600 hp workstations - hp-ux 11.x graphics administration guide - Page 24

shared memory extension MIT_SHM, Table 2-1, Power saving states defined by VESA

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configuring X Windows on HP-UX (HP Visualize graphics cards) X Server configuration Table 2-1 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). Power saving states defined by VESA Level 0 1 2 3 State DPMS Compliance Requirements Screen Saver Stand-by Suspend Off Not Applicable Optional Mandatory Mandatory Power Savings Recovery Time None Minimal Substantial Maximum Very Short (

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configuring X Windows on HP-UX (HP Visualize graphics cards)
X Server configuration
Chapter 2
22
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