Is it possible to disable ACPI Suspend in Windows XP?

Question

Is it possible to disable ACPI Suspend in Windows XP?

I don't mean the "Control Panel, Power Settings,..., choose never to sleep, actions on button, choose 'ask me', actions on close lid, choose 'no action', etc..." solution. [1]

I mean totally disable the suspend functionality, the same way I can totally disable Hibernation by uncheking a box inside a tab in Power Settings that is made for this purpose.

[1] That takes a long time to do and somehow stops on several other annoyances, such as this setting not being properly propagated to each user account.

Solution

I believe this should achieve what you're after.

Open up regedit and navigate to the following location:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ACPI\Parameters

Create a new DWORD value named Attributes, set it's data to hexadecimal and input the value 70.

Exit regedit and reboot.

Comments

[user39559]

Thanks. What does the 70 mean? Is it a binary expansion of a bunch of settings like in linux file permissions?

[DMA57361]

@user - I've no idea. Possibly. I came accross this answer in several places though, so it would appear to be a good bet.

[user39559]

Wouldn't it ruin other controls, like fan control, screen luminosity, or even the Power Off functionality?

[user39559]

Indeed it is. I googled the registry you mention and found a lot of links as well. 7=111 in binary which disables all S1, S2 and S3 suspend modes. msfn.org/board/topic/74843-disable-standby-tweak tomshardware.com/forum/81483-45-stop-computer-standby blog.tiensivu.com/aaron/archives/… exoid.com/?page_id=47 infdump.com/inffiles/B/BIOSINFO.INF

[DMA57361]

@user39559 Good bit of reseach that, and good intuition on it being a bit field.

[harrymc]

@user39559: It might entail some lose of functionality, but that depends on the computer model. Which is why I suggested the system restore point as a way back.

[user39559]

Well, 3, 7, 15 and 63 are suspicious numbers.