Late 2014 5K Wake Issues

[SamPotts]

I recently inherited my work 5K iMac to use at home to replace my ageing, but very reliable 2009 hex core Mac Pro. I set it up with a Thunderbolt and an LED Display for 3 screens total. Everything was working well until I enabled sleep, by unchecking "Prevent computer from sleeping automatically when the display is off". It would sleep fine and then about 20 minutes later, I'd hear the chime of a reboot. I'd not touched it during this time. A quick Google and search around suggest that sleep simply doesn't work on these machines. Surely that can't be right? I don't really want a massive power bill. Australian power is expensive enough as it is

The machine is running 10.11.5 beta (latest) although I'm not sure it's related?
[doublepost=1462545958][/doublepost]Not sure if it helps but here's the latest crash log:
https://cloudup.com/cDOAgQfdrPF

 

[roadkill401]

I would check the power usage first. But I believe that the computer itself pulls very little power when it is idle doing nothing. What is the killer is your screen.

take a look at https://forums.macrumors.com/threads/how-much-power-does-my-imac-draw-when-display-is-off.1360960/

I don't have any of the issues that you are saying you are getting with my 2014 RiMac. I just press the shift-Control-Eject combo to turn my monitor display off and it doesn't make a sound or do anything wrong. I suspect that you have a flakly install. Now I will admit that I have had all sorts of issues and my mac seems to flake out with other issues. but I have been assured by Apple that there is nothing wrong with my hardware and I just have to re-install a clean version of OSX and all will be well. For the most part it is until something else goes wrong. Perhaps you have a machine like mine that needs a new OS ever few weeks/months.

 

[SamPotts]

Do you sleep yours regularly? I wonder if it's something to do with the thunderbolt display or external displays in general. I keep reading horror stories about them with sleep and wake.

I've just tried a few things:
- pmset standby 0
- pmset autopoweroff 0
- unchecked Powernap
- unchecked Wake for network access

This allowed the machine to sleep and wake fine but then the thunderbolt display didn't wake. It appears this is a seperate issue and there's several threads on it that say using a thunderbolt male to male solved their issue. I tried that and everything seems to be working now. Not ideal but better than nothing. I will keep playing around.

 

[roadkill401]

I have only used a single TB external display, and it worked just fine for the period that I had it hooked up. I then came to the realisation that my brain was no longer young and trying to slog my way through web page deign was not going to happen and I had more fun things to occupy my free time with.

So in answer to your question, it didn't make a difference for me. I have an external TB Lacie drive as well plugged into the other port.

I honestly don't know if I am really sleeping the iMac or just having the front display turn off. I had one of those kill-o-watt meters that show how much power a device is pulling and to be quite honest it was not anything worth writing home about. I live in Ontario that has some of the most expensive power costs in the whole of North America, and likely the world. Our government controls the prices and they promote conservation but if they don't get enough profit from selling power then they just jack up the rates.

I have set my iMac to turn off the monitor after 7 minutes. Have it allowed to power nap and wake for network access. Over night it pulls around 16w/h of power, that works out to about 1/3rd of a Kilowatt. Our price for power is broken down into cost of power (time of day variable rates) plus delivery & debt charges. the killowatt cost is really small compared to the more fixed cost of delivery and debt. The energy side at the most peek rate is $0.18/kwh. so over the course of a year on idle the iMac uses about 140khw or about $28.50 in actual power costs.

 

[SamPotts]

Sounds like a similar setup then. Blimey, I thought Australian power was expensive. It looks like on average I pay 21c/kWh (off peak + peak average) which is 15.50c in USD. So leaving it on won't cost me the earth it seems. That's pretty good then as a last resort if I can't fix it at least. Cheers for your help!