Can't wake from S3 with keyboard. Tryed all "solutions".

This problem has been annoying me since weeks. I've spent countless hours looking for solutions on google and i can't fix it.

My HTPC can go in S3 standby mode successfully. BUT the only way to wake my computer is to press the power button. When i wake it up, it starts where it was before so S3 mode is working. Problem is just waking it up.

The weirdest thing is that it USED to work. Around 2 months ago i was waking up my computer with my keyboard and it worked. But i stopped to use this feature, and now that i need it, it isn't working anymore.

Oh, also wake-on-LAN isn't working neither. And it also used to be working 2 months ago. I really don't know what happenned.

Here's a couple of screenshots. Sorry my windows is in french, but i'll translate the text for you:



Picture from my BIOS



Device manager -> Keyboard -> Power management
>>> Option "Allow this device to wake computer from standby mode" is checked
>>> Option "allow computer to turn off this device to save energy" is unchecked and greyed out



Device manager -> Network cards -> Realtek PCIe -> Advanced
>>> Wake on pattern match : ACTIVATED
>>> Wake on Magic Packet : ACTIVATED

Can't see it on screenshot but the option "Stop wake on LAN" is DISABLED (i also tryed to turn it on but it doesn't change anything)


"powercfg -devicequery wake_armed" tells me that my keyboard is allowed to wake my computer

"powercfg -a" tells me that S3 mode is supported, but S1 and S2 is disabled (that's normal)


Power configuration :

S1 after : Never
Allow hybrid mode : Yes
S3 mode after : 60 minutes
Allow wake timers : No
Selective USB suspension : Off


My hardware:
AMD A6-3650 APU W/ AMD Radeon 65XX HD / Socket FM1 2.6GHZ 4MB 100W
Gigabyte A75M-D2H
Antec Fusion Remote Black HTPC Case
Seasonic 450w 80+Gold (fanless)
4GB G.SKILL Ripjaws X F3-12800CL9D-4GBXL DDR3-1600
Crucial M4 SSD

Solutions tryed, uncessfully:
- resetting BIOS/CMOS
- updating BIOS and all other drivers to latest versions
- disabling all other USB devices
- tryed every single USB slots, with and without USB hubs, usb2 instead of usb3 and vice-versa...
- tryed with two different power supplies
- tryed different keyboards
- tryed mouse instead of keyboard, LAN instead of USB...


Seriously..... I'M DESPERATE !!! It used to work. Why it won't work anymore :(
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  1. UPDATE

    Just tryed doing a "repair" installation of Windows 7 .... didn't help

    I also did a couple of other tests using other keyboards and adapters laying around. Just found out that i can wake my computer using a PS2 keyboard. But this PS2 keyboard won't work in USB port if i use a USB to PS2 adapter.
    Here is the result of my tests :

    10-years old PS2 keyboard:
    - PS2 Port : Able to wake PC using PS2 port
    - USB Port : NOT able to wake PC using USB to PS2 adapter

    (USB) "No name" cheap mini keyboard bought on ebay :
    - PS2 Port : Able to wake PC using PS2 to USB adapter
    - USB Port : NOT able to wake PC using USB2 or USB3 ports

    (USB) Frisby cheap keyboard bought on ebay :
    - PS2 Port : Able to wake PC using PS2 to USB adapter
    - USB Port : NOT able to wake PC using USB2 or USB3 ports

    wireless IOGear GKM681R
    - PS2 Port : NOT able to wake PC using PS2 to USB adapter
    - USB Port : NOT able to wake PC using USB2 or USB3 ports
    - This keyboard used to be able to wake my PC 2 months ago

    Acer USB keyboard KU-0355
    - PS2 Port : NOT able to wake PC using PS2 to USB adapter
    - USB Port : NOT able to wake PC using USB2 or USB3 ports
    - This keyboard used to be able to wake my PC 2 months ago


    So, i'm still not able to wake computer using USB ports, no matter what i do. Wake-on-lan still doesn't works.

    Looks like a motherboard problem ?
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