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System no longer cuts power on standby

I

imported_BIOSMonkey

Member
I have an Asus a8n-sli board. I have the power button configured to put the system into standby, and when it did so it cut most of the power to the system (front light blinks, but all fans/hard drives stop, lights go out, etc). Pressing a key on the keyboard woke everything back up, and came back into Windows (no reboot).

But then, something happened a few days ago, and I don't know what. The system still goes into some power management state (monitors cut out, and front light blinks) but power is still alive in the system (hard drives, fans still spinning, lights still on).

There are no splats in Dev manager. I have not change any BIOS settings.

Are there tools to determine if some device/driver is interfering with the standby process? Also, is cutting the power controlled at the board level by the chipset or by some signal sent the power supply?
 
I fixed it.

To summarize, my system WAS going to S3, then something happened that would only let it go to S1.

I had switched my mouse from PS2 to USB, and discovered that in the Device Manager/mouse properties the power management option was set to "Allow this device to bring computer out of standby". This option with a USB mouse prevents the system from going into S3, since that state would power down the mouse and not let it wake the system.

Unchecking this put things back to normal.
 
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