Mini hibernates despite pmset saying it shouldn't

Question

Hello. My new (late 2012) Mac Mini is great, but I&#x27;ve noticed that after putting it to sleep, an hour later it wakes again (although not the displays) to write everything in memory to disk.  I&#x27;d rather turn this off (it seems a bit pointless given I have 16GB RAM and it just creates a ~20 or so pause when I start the Mini up again whilst it reads everything back off the disk.  Also if I did ever have a power cut, there&#x27;d be just as much chance of it happening whilst I was actually using the computer as when it was sleeping, so...)Anyway, the output below says &#x27;hibernatemode&#x27; is set to zero, which from everything I&#x27;ve read suggests it shouldn&#x27;t be using it.wt-macmini:~ wt$ pmset -gActive Profiles:AC Power                    -1*Currently in use:standby              1powerbutton          1womp                 0autorestart          0hibernatefile        /var/vm/sleepimagenetworkoversleep     0disksleep            10sleep                180autopoweroffdelay    14400hibernatemode        0autopoweroff         1ttyskeepawake        1displaysleep         30standbydelay         4200Any suggestions?Thanks,William

wturrell · Answer

Update - on further reading of http://www.manpagez.com/man/1/pmset/ it seems that &#x27;standby&#x27; is an overall trigger for using hibernation, so I&#x27;m trying with it set to 0 instead...

knight011 · Answer

This was happening to my, after alot of searching I found out it&#x27;s the "AutoPowerOff &#x3D; 1" and AutoPowerOffDelay &#x3D; 14400" thats causing it to switch off/go into hibernation mode.Use this command in terminal to turn it off:sudo pmset -a autopoweroff 0This is what my pmset -g is set to.Active Profiles:AC Power        -1*Currently in use: standby              0 powerbutton          1 womp                 1 autorestart          0 hibernatefile        /var/vm/sleepimage networkoversleep     0 disksleep            0 sleep                15 autopoweroffdelay    14400 hibernatemode        0 autopoweroff         0 ttyskeepawake        1 displaysleep         15 standbydelay         4200

Frank D&#x27;Anna · Answer

Autopoweroff didn&#x27;t make a difference for me. I&#x27;m going to try standby next.

milanprokop · Answer

Unfortunately autopoweroff, standby, autopoweroffdelay nor standbydelay didn&#x27;t make a difference for me, the computer always goes to Safe Sleep over night. I&#x27;m kinda frustrated form it cause whatever I try it&#x27;s always the same 😟Furthermore they say "standby only works if hibernation is turned on to hibernatemode 3 or 25." and "standby causes kernel power management to automatically hibernate a machine after it has slept for a specified time period." So how come that my iMac hibernates when I have hibernate mode set to 0 and the "specified time period" is set to 24 hours???