Browse Prior Art Database

Power Management Solution

IP.com Disclosure Number: IPCOM000114952D
Original Publication Date: 1995-Feb-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 87K

Publishing Venue

IBM

Related People

Deckys, DJ: AUTHOR [+3]

Abstract

A program is disclosed that implements a decision making technique for supporting display power management functions.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Power Management Solution

      A program is disclosed that implements a decision making
technique for supporting display power management functions.

      Presently, system level BIOS can not determine if a display is
capable of providing power management modes of operation.  The
monitor ID can not be used because the industry has moved away from
using monitor IDs.  There will be no automatic way to distinguish the
first IBM* power management displays due to this same limitation in
the monitor ID (the generic 8514 monitor ID is being used for the
Galaxy display family).

      In addition, attempting to place existing non-power management
capable display in power saving states could cause damage to the
display (i.e., the VESA Display Power Management Signaling - DPMS
Proposal, Revision Number 0.4P).  A fail proof method of recognizing
when a power management display is attached to the system is needed.

      A systems level Basic Input Output System (BIOS) that is
capable of Advanced Power Management (APM) is not able to determine
if the display attached is capable of power management modes of
operation and therefore is unable to set the display in any power
management mode.

      As system level BIOS starts to include APM functions for video,
they will need a method to determine if the display attached is
capable of operating in any of the power management modes.  After
this determination has been made, the system BIOS can enable APM
function that can be used by operating systems and device drivers.
The Figure illustrates the decision flowchart that must be made to
support display power management function.

      Implementation of the described technique will allow power
saving modes of operation as defined in [1].  The implementation
method is a function of each particular display and is not explained
in (1).  BIOS will provide the insulating layer to...