Cyberpower UPS won't wake sleeping Mac Pro

[41qser]

I've performed dozens of searches to find an answer with no luck...

Mac Pro: 2 x 2.66
UPS: CYBER POWER CP1500LCD, USB plugged directly into MP, using OS X Energy Saver prefpane (no 3rd party programs)

Everything is fine when the MP is awake and running normally.

But if I sleep it, then kill power to the circuit the UPS is on, it won't wake up. If I unplug and replug the USB cable, it causes the MP to wake and the warning about power failure pops up.

Any ideas? It's not a crisis as the MP will sleep on battery for quite a while... but I'd still prefer it to wake and shutdown gracefully.

[41qser]

Using the Deep Sleep widget, I've worked around this issue: I changed the default sleep behavior to Safe Sleep (hibernation+sleep).

When I'm on the grid, my computer will now safe sleep after 3 hours of non-use.

If I go off the grid and onto UPS while the MP is awake, the Energy Saver preferences will safe sleep after 1 minute. If for some reason this doesn't occur, Energy Saver will invoke a shut down after 5 minutes.

If I go off the grid and onto UPS while the MP is safe sleeping, no big deal since contents are written to the HDD and RAM with this configuration.

[zfilipov]

Hi, I am wondering about the same issue. So by using this widget, everything will be fine if my iMac is in deep sleep mode if it loses USP power?