APM Features May Be Unavailable in Windows 95

 Last reviewed: July 10, 1996
Article ID: Q137402
The information in this article applies to:
  • Microsoft Windows 95

SYMPTOMS

After you install Windows 95, you may notice that none of the Advanced Power Management (APM) features were installed, or that there is no battery meter.

CAUSE

Some computers and BIOS revisions have known incompatibilities with the APM 1.1 specification. You may be running Windows 95 on such a computer.

RESOLUTION

Although the hardware suspend functions of your computer should still function correctly, you cannot use the Windows 95 APM features.

MORE INFORMATION

Different levels of APM are turned off by Windows 95 when it detects an incompatible BIOS.

Windows 95 turns off APM support completely on the following computers: 

   AMIBIOS 07/08/94
   AMIBIOS 07/08/1994
   Wyse Forte GSV 486/66
   Ultra laptop 486sx33
   Zenon P5/90
   DECpc LPv+ 1.00
   DECpc LPv+ 1.01
   DECpc LPv+ 1.02
   AST Ascentia 900N
   any Gateway ColorBook with APM 1.0
   any Gateway ColorBook >1.0 w/SystemSoft BIOS
   Canon Innova 150C
   NCR/AT&T 3150
   NCR/AT&T 3150
Windows 95 turns off power status polling (so you do not see a battery meter) on the following computers: 

   IBM ThinkPad 500
   LexBook
   WinBook
Windows 95 uses APM 1.0 mode on the following computers: 

   NEC Versa and AT&T Globalyst with APM 1.1 BIOS and no
   Plug and Play BIOS
The following IBM ThinkPad computers support APM 1.1: 

   ThinkPad 755C
   ThinkPad 360/355 Family
   ThinkPad 755CE/CD/CX/CV/CDV
   ThinkPad 340CSE
   ThinkPad 370C
   ThinkPad 701C
   ThinkPad 530CS
The following IBM ThinkPad computers work with Windows 95, but only APM BIOS 1.0 is supported: 

   ThinkPad 750 family
   ThinkPad 340 (monochrome)
   ThinkPad 230Cs
For information about the differences between APM 1.0 and APM 1.1, please see the following article in the Microsoft Knowledge Base: 

   ARTICLE-ID: Q119599
   TITLE     : Differences Between Using APM 1.0 and APM 1.1
The ASUS PCI/I P55SP4 motherboard with a SiS 5511/5512/5513 chip set and an AWARD BIOS has been known to exhibit similar problems. The battery meter may appear on the taskbar when it should not.

ASUS states that this was fixed with Plug and Play BIOS version 0110 (11/21/95) for revision 1.2 and 1.3 motherboards. Revision 1.4 motherboards have this fix using Plug and Play BIOS version 0303 (11/21/95).

Please contact ASUS for information about BIOS updates.

KBCategory: kbhw
KBSubcategory: win95
Additional reference words: 95 pnp

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Last reviewed: July 10, 1996
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