Browse Prior Art Database

Improved Power-On Sequence for the Notebook Computers

IP.com Disclosure Number: IPCOM000117476D
Original Publication Date: 1996-Mar-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Dang, H: AUTHOR

Abstract

Disclosed is a way of reducing the power consumption of the Notebook computers at power-up time by reordering the turn-on sequence of the peripheral devices.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 63% of the total text.

Improved Power-On Sequence for the Notebook Computers

      Disclosed is a way of reducing the power consumption of the
Notebook computers at power-up time by reordering the turn-on
sequence of the peripheral devices.

      In the IBM* LX40** Notebook computer, the major peripheral
devices are turn on and tested in the following sequence:
  1.  Initialize the Liquid-Crystal Display (LCD) and turn on the
Back
       Light
  2.  Turn on the Hard drive and execute the self-test program
  3.  Power up the Floppy drive and try to boot up from the diskette
  4.  If the Floppy time-out then boot-up from the hard drive
  5.  System is ready after 21.5 seconds.

      Notice that the Hard drive is turn on 16.8 seconds before data
is read.  This extra time allows the drive to warm up and to become
ready.  This is true for many 3.5" and 5.25" DASDs used in the
desktop computers.

      Notebook computers use the smaller form-factor disk drives
which spin up faster and become ready within 5 seconds.  So the
power-up sequence could be changed to:
  1.  Initialize the LCD and turn on the Back Light just like before
  2.  Power up the Floppy drive and try to boot up from the diskette
  3.  Turn on the Hard drive 9.5 seconds later
  4.  If the Floppy time-out then boot-up from the hard drive which
       just became ready
  5.  System is ready after 19.3 seconds

The LX40 consumes 226.8 Joules with the current start-up sequence and
188.6 J...