Issue with power saving mode

[privoid]

Hello there!

So today I configured my windows power saving options and I made it so that when I don't do anything my computer goes into power saving mode after 15 minutes. Now for some reason, whenever the OS automatically enables power saving mode and all my fans turn off, I'm instantly back on the desktop, as if I would press the power button. But when I enable this mode myself (so I go to the options where you would normally shutdown the computer and then activate power saving mode), the fans stop turning and the power button flashes every couple seconds, just like it sould be, and if I press the power button, the computer goes back to the Windows desktop. Now my question is why does this work when I turn on this mode myself, but why doesn't it work when it's automatically going into this mode?

 

Some informations:

- I think this may have to do with some settings in the UEFI (not sure), and in the UEFI I set the "Wake up event by" to OS (it was BIOS before) but both options didn't work (my motherboard: MSI A78M-E35)

  (btw: a screenshot of the option is attached to the post, MSI has got a cool in-OS-BIOS application :D)

- My operating system: Windows 7 Professional (64-bit)

- All my other specs are on my profile, but I think the ones stated above are the important ones here

 

Thank you in advance