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S3 sleep mode - fan keeps going (Windows 7)

Posted on 2011-10-09
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Last Modified: 2012-06-27
I am using MCE Standby Tool to set my Windows 7 PC to go into sleep mode.

Should the fan turn off on S3 sleep mode?

If the fan does not go off then does it mean that its not going into S3 sleep mode? - Case fan does no turn off, have not looked at CPU fan, power light is flashing also.

I would like it so the case fan and CPU fan turn off so there is less noise.

I have an ASUS P5Q motherboard.

Cheers anyone
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Question by:Johny_Brav0
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by:garycase
ID: 36939797
Check your BIOS to see what the power settings are for sleep mode -- it can be set for either S1 or S3.

Note that it has to be set for S3 BEFORE an OS is installed or the sleep mode won't be correct.

To answer you question:  Yes, the fans should be off if your system is in S3
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Author Comment

by:Johny_Brav0
ID: 36941847
So if OS was installed after BIOS says S1, then S3 will not work.

Before I reinstall OS, what else would be stopping it entering sleep mode. BTW the screen turns off when attempting S3 sleep.

I use this:
POWERCFG -ENERGY
I wont post the output but there are 11 USB errors like this:

USB Suspend:USB Device not Entering Suspend
The USB device did not enter the Suspend state. Processor power management may be prevented if a USB device does not enter the Suspend state when not in use.
Device Name      USB Root Hub
Host Controller ID      PCI\VEN_8086&DEV_3A34
Host Controller Location      PCI bus 0, device 29, function 0
Device ID      USB\VID_8086&PID_3A34
Port Path

I am thinking this is the reason, so I am going to try with a PS2 mouse and unplug some USB stuff.

Wise approach?
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by:garycase
ID: 36944128
Yes, if the BIOS is set for S1 sleep mode instead of S3, then you need to change it to S3 and reinstall for things to work properly.

If the BIOS is set for S3, but your USB devices are set to not turn off (in Windows power management), this could also be causing a non-standard sleep ... especially if your total power draw for memory + USB devices exceeds the 5v standby current of your PSU.    A USB mouse wouldn't come close to causing this ... but if you have a lot of USB devices, they could be contributing => but simply changing the settings in power management to disable them should fix this if that's the issue.
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Author Comment

by:Johny_Brav0
ID: 36944294
Just used MCE Standby Tool and got this:
Show sleep blockers option:

DISPLAY:
None.

SYSTEM:
[DRIVER] ?
[DRIVER] ?
[DRIVER] Legacy Kernel Caller
...

Any idea what  Legacy Kernel Caller is?

MCE Standby Tool changes all USB to enable sleep and I have tried just keyboard and mouse sleep so less than 5v. Might try a program to measure voltage though - memory.

Failing above I might reinstall on S3 in bios.

Failing that send motherboard back still under warranty.

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Expert Comment

by:garycase
ID: 36944308
Was the BIOS set to S3 sleep?   ... or did you have to change it to that?
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by:Johny_Brav0
ID: 36944340
Good question but I have changed it so many times that I dont know.
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by:garycase
ID: 36944431
Sounds like the only way to know for SURE that the OS was installed with the BIOS set to S3 is to re-install.

One other possibility:   There are quite a few add-in cards that are not S3-compliant ... TV tuners; video capture cards; some video cards; some network cards;  etc.    If you happen to have one of these, then you'll find one of two things:  (a)  the system won't ever go into a fully compliant S3 mode; or (b) the system will enter S3 okay, but when you "wake" it back up, the non-compliant card won't work properly until you reboot.
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Accepted Solution

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garycase earned 2000 total points
ID: 36944455
... Because of the non-compliant card issue I just noted, I never use sleep for my HTPC's => I simply set them to turn off the display and hard drives after a few minutes (30 for display, 60 for HDD) when not in use.   I only use S3 on laptops.
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Author Comment

by:Johny_Brav0
ID: 36992680
Well just sent the motherboard back.

Intergrated NIC was broken by a thunderstorm so that might be the reason for sleep mode problems also.

Will continue this thread when it arrives back.

Cheers for answers
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Author Comment

by:Johny_Brav0
ID: 37093472
MB coming back today so an answer will be soon.

Sorry for resurrecting an old thread.

Will award points hopefully
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Author Comment

by:Johny_Brav0
ID: 37095733
Mobo fault - now all working
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