I have a desktop PC plugged into a wall power socket that wakes up from sleep when some other device is turned on plugged into a power socket in the room (different socket other side of room, but most likely power running from the one wall socket to the other). Seems to depend somewhat on the load of the device turning on. e.g. plug a heater in and turn it on and the computer will wake from sleep.
Is their a bios setting or something else I can do to stop the computer waking from sleep in this fashion?
UPDATE:
Ok spent the last 30 min trying all sorts of different combinations to rule things out. Computer only wakes up when keyboard and mouse are plugged into the USB hub. Hub itself with nothing plugged in doesn't have an issue, only when keyboard + mouse plugged in.
So somehow fluctuations in power in the room result in the keyboard/mouse waking the keyboard up when going through the hub. Very odd. Anyone know why?
Answer
Best guess would be that all the outlets are on the same circuit so a power drop on one outlet creates a power drop on all outlets. Your computer is most likely plugged into a surge protector, not a UPS. It is running in sleep mode so the processor is spun almost off, main power to all devices except for USB is mostly off. Video, HDD... all spun down. The USB power is kept for "Wake on USB". Assumes USB keyboard and/or mouse. Wake would bring system out of sleep when it detects keyboard input or mouse shake.
During the power blip, the USB 5 volt drops a bit since the power supply is mostly shut off. Result is when the power comes back the USB sees almost like an input signal and wakes your computer.
Could try: powered USB hub (maybe it won't be so sensitive to the power drop?) or UPS on computer.
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