Ok. Let's get some clarifications first.
1. S5 is Soft Off, same as "complete shutdown". According to wiki
:For S5 Other components may remain powered so the computer can "wake" on input from the keyboard, clock, modem, LAN, or USB device.
The device need to be configure to retain power
(some old mobo doesn't support it?)
2. I've read so far:
Some IR6 receivers does understand discrete power on/off "out of the box".
Some required tweaking (register changes) to make it work.
And some just don't work.
Example (I've read somewhere on forums):
HP 5187-4593 worked fine on HTPC (wake up works)
The guy put another IR6 - it can control WMC with very same remote control, but wake up doesn't work anymore.
I assume USB was configured not to go to sleep already.
Or do we need to configure a USB device not to go to sleep?
That's way one IR can wake up PC (is was powered up), but not another (it was unpowered)?
And don't know yet, what is tweaking (register changes) is about
Didn't mean to offend anybody!
Just trying to dig out the truth