Q: iMac asking firmware password after waking up from sleep

Yes, the login password sorry. But the one you need to enter after you enable the filevault, with the white background. That's the one that is asked to me when i wake up the mac and soon after it ask me my local account password like it do normally. It did it today again, i had to wake it up from the rear button.

Yesterday i tried to reset the pram and i ran an hardware test but everything was ok...

I don't see the progress bar, i just see a white screen after a few seconds i wake up the pc asking me for the password. What i found out is that this happens only if i wake it up after some ours it was sleeping, not after minutes and the frustrating thing is that all my bluetooth with the input devices are gone and i have to press the side button of the keyboard and trackpad different time to be able to entre any password.

Maybe this is what happen when safe sleep works with filevault activated? My question is why this never worked till two days ago and anyway, is working very badly.

I think i've found a clue. Seems to me that after few hours, the mac destroy the filevault key. I've found out this thread:

https://discussions.apple.com/thread/4934852?start=0&tstart=0

but only when playing with the pmset command from terminal, i've discover the "destroyfvkeyonstandby" option that is described also here:

https://discussions.apple.com/thread/3508926?start=0&tstart=0

now i'm trying to understand how to postpone the key destruction to at least 24 hours and see if it works.

here it is:

Active Profiles:

AC Power                    -1*

Currently in use:

standby              1

powerbutton          1

womp                 1

halfdim              1

hibernatefile        /var/vm/sleepimage

autorestart          0

networkoversleep     0

disksleep            10

sleep                15 (sleep prevented by 9248)

autopoweroffdelay    14400

hibernatemode        0

autopoweroff         1

ttyskeepawake        1

displaysleep         10

standbydelay         4200

After i few test, i found out that the command DestroyFVKeyOnStandby has no effect, whatever i put it in state 1 or 0, after the wake up from sleep, i'm always asked for the filevault password. So the only option i have is to delay the "standbydelay" parameter to 24 hours, so i put it at 86400. I wonder how it was in the past, since it's the first time i see all this happening on this iMac.

Also the pmset man page state this:

"standby only works if hibernation is turned on to hibernatemode 3 or 25."

but i have that set to 0, and the standby works anyway like it is set to 25, considering the slowness of the wake up.

the deactivate and reactivate test was in my mind but i didn't yet because it would took time. However, i tried to set the destroyfvkey both 1 and 0 and put the standbydelay to 30 seconds so i could check immediately and there is no effect, the password is always asked on standby whatever you set the destroykey. Maybe it's another bug or they choose to set it permanently to 1 with the lastest update...

Thanks for your support!