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Kernel Assertions: 0x10c=USB,BT-HID,MAGICWAKE Pid 35(): 01:06:40 PreventUserIdleSystemSleep named: ""

Timeout will fire in 1774 secs Action=TimeoutActionRelease I'm having the same problem, with these outputs: This shows things which are asserting "don't sleep, don't shut down" sorts of events.

Take a look at the output of pmset -g assertions. I only tested with 1 UPS so far, a Furman F1500-UPS, but it is now functioning as expected. Updated -After seeing Eric's reply below, I installed OS X 10.10.2 (14C106a) beta. I was told I might hear something back today if there's a quick fix or workaround, otherwise this issue may not be resolved until 10.10.2 is released. Updated -After reporting this bug to Apple and several back and forth calls with them, this issue has been passed up to the engineering team that deals with Power Management. Have gone back & forth with Apple support about this for the last week and they haven't informed me of any progress on this issue yet. Updated -I have now tested 3 different brands of UPS with 3 different Macs all with the same results. Updated -I booted the aforementioned iMac from an external Yosemite boot drive and it displays the same behavior as the Mac Mini. I tried booting from an external drive that has OS 10.8.5 on it, but the Mini would not let me do this. I also tried triggering a shutdown by "haltlevel" 100 (shutdown when battery dips below 100%) and the machine is still not shutting down. Updated -I have verified in Terminal that "haltafter" is on and set to 1. I also tested with a Furman F1500-UPS in place of the CyberPower unit and there has been no change in the behavior. Today I installed OS 10.10.1 update and tested again with the same results. Updated to add: I tested with the CyberPower 825VA and the Mac Mini running OS 10.10.0. I have tested this with an iMac running Mavericks (10.9.5) and the UPS behaves as expected, but on the Mac Mini running Yosemite the computer does not shut down and just continues to run off the battery. Our UPS is set to shut down the computer after running on battery backup for 1 minute. We just received a brand new Mac Mini, which came with Yosemite pre-installed.