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From: Paul 
Newsgroups: microsoft.public.windowsxp.general
Subject: Re: Unable to "Standby" my ThinkPad T23 Laptop
Date: Wed, 15 Nov 2017 17:58:21 -0500
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jaugustine@verizon.net wrote:
> Hi,
> 
>        I have an old IBM ThinkPad T23 laptop that I use every day.
> I normally keep it on for hours.  Therefore I use the AC adapter
> all the time.  It has WinXP Home Edition SP2.
> 
>        Unfortunately,  if I click on the "Turn Off Computer" at "Start"
> button,  the pop-up window allows me only 3 of 4 options:
> 
>      "Stand By" is NOT enabled!!!
> 
>      "Turn Off"
> 
>      "Restart"
> 
>      "Cancel"
> 
>       Note: My Gateway desktop computer's "Stand By" is enabled (same WinXP
> version).
> 
>       How can I enable "Stand By" on my ThinkPad T23?
> 
>          Thank You in advance,  John

You might need to use dumppo.exe and do an override.

Stuff like this can happen, if you have a BIOS with
ACPI settings.

     S1 only  <--- screws up Windows, needs dumppo.exe to repair
     S1&S3    <--- preferred, allows sleep

There might also be an ACPI version setting (of all things).
Make sure the ACPI version is set to the highest value listed,
for best compatibility with your OS.

(Dumppo, doing an override to restore Sleep)

http://forums.pcper.com/showthread.php?p=1825058&postcount=31

This tool doesn't work in Windows 10. It's only for older OSes,
if at all. It's hard to say how many more years this link is
going to work. The program is only 12KB or so, it's tiny,
and should have been put on the OS installer disc.

ftp://ftp.microsoft.com/products/Oemtest/v1.1/WOSTest/Tools/Acpi/dumppo.exe

Here's a scan of dumppo.exe from the FTp site.

https://www.virustotal.com/#/file/f05702224c6d6be2a2d5753ea9bf0ff50e3afd003addc
1deb88c858664190a2a/detection

And an alternative download location.

http://web.archive.org/web/20050308214646/http://www.bellamyjc.net/download/dum
ppo.exe

The Bellamy copy is clean, even if it appears to be
a different version of the previously available Microsoft FTP copy.

https://www.virustotal.com/#/file/0716c1d88c219fce95c3a1114aae24700fbffaeab5265
3c4c1c2ae8484835877/details

DUMPPO.EXE admin /ac minsleep=s3

Use the "dumppo admin" command first, to review whether
an override is even necessary. As it could be that
something else is broken (hardware-wise).

    Paul
--- Platinum Xpress/Win/WINServer v3.1