H55-USB3 F4 S3 Power Management

[murphman73]

My previous MSI / AMD build allowed me to power up PC from a cold boot using a PM wake event such as hitting any key or clicking the mouse.
Present Gigabyte H55-USB3 F4 does not seem to allow the wake/ power up from from cold boot.
I understand that S3 stores system state in RAM and in theory is functioning properly when waking from sleep mode.
It's just not what I'm used to and am surprised a MB from 5/2006 had this capability while a 7/2010 MB would not.
I have S3 enabled, S5 disabled, and PM events enabled for keyboard and mouse in bios.

Is my current S3 power management designed to wake in sleep mode only, from a cold boot, and is there some bios option needed that I missed.

Thanks for any input on this.

[Dark Mantis]

Please can you let us know what revision your motherboard is?

[murphman73]

 Rev 1.0

[Dark Mantis]

I have been looking through your manual and as far as I can see it should be possible to do what you want, eg power on by mouse/keyboard. The only thing that looks as if it could upset your use of this feature is the:
EuP Support
Determines whether to let the system consume less than 1W power in S5 (shutdown) state. (Default: Disabled)
Note: When this item is set to Enabled, the following four functions will become unavailable:
PME event wake up, power on by mouse, power on by keyboard, and wake on LAN.
I hope this helps.

[murphman73]

Agreed. Per your paste from the  manual, S5 enabled is a more aggressive power saver scheme that when enabled would prevent system boot initiated by PME events.
Funny thing is the PME events work (almost) as intended when PC is in sleep mode vs shut down. A caveat is the bios describes the mouse PME as a "double" click. It may be of no significance, but only a single click wakes the box.
Another possibly irrelevant fact is the keyboard F lock light is on when totally shutdown. KB uses the sole PS2 connector on the MB.
Thanks for your feedback.

[Dark Mantis]

No problem, glad to be of help.