Sleep Better with OS X 4 months ago
My mid 2012 Macbook Pro had sleep inertia. I'd wait for 10-15 seconds for the screen to turn on after opening the lid, and then upwards of another 10-15 seconds until it would accept any input. Who has 30 seconds to wait around? Those YouTube cat videos aren't going to watch themselves.
Some searching led to a variety of article describing how to "fix" how OS X sleeps with little explanation of what you actually were changing. The common thread was using pmset to modify hibernatemode.
When in doubt, read the man page.
You can view your current sleep configuration with:
nate@nirvana ~> pmset -g | grep hibernatemode
Here's the relevant bit from the man page:
SAFE SLEEP ARGUMENTS hibernatemode takes a bitfield argument defining SafeSleep behavior. Passing 0 disables SafeSleep altogether, forcing the computer into a regular sleep. ____ ___1 (bit 0) enables hibernation; causes OS X to write memory state to hibernation image at sleep time. On wake (without bit 1 set) OS X will resume from the hibernation image. Bit 0 set (without bit 1 set) causes OS X to write memory state and immediately hibernate at sleep time. ____ __1_ (bit 1), in conjunction with bit 0, causes OS X to maintain system state in memory and leave system power on until battery level drops below a near empty threshold (This enables quicker wakeup from memory while battery power is available). Upon nearly emptying the battery, OS X shuts off all system power and hibernates; on wake the system will resume from hibernation image, not from memory. ____ 1___ (bit 3) encourages the dynamic pager to page out inactive pages prior to hibernation, for a smaller memory footprint. ___1 ____ (bit 4) encourages the dynamic pager to page out more aggressively prior to hibernation, for a smaller memory footprint. We do not recommend modifying hibernation settings. Any changes you make are not supported. If you choose to do so anyway, we recommend using one of these three settings. For your sake and mine, please don't use anything other 0, 3, or 25. hibernatemode = 0 (binary 0000) by default on supported desktops. The system will not back memory up to persistent storage. The system must wake from the contents of memory; the system will lose context on power loss. This is, historically, plain old sleep. hibernatemode = 3 (binary 0011) by default on supported portables. The system will store a copy of memory to persistent storage (the disk), and will power memory during sleep. The system will wake from memory, unless a power loss forces it to restore from disk image. hibernatemode = 25 (binary 0001 1001) is only settable via pmset. The system will store a copy of memory to persistent storage (the disk), and will remove power to memory. The system will restore from disk image. If you want "hibernation" - slower sleeps, slower wakes, and better battery life, you should use this setting. Please note that hibernatefile may only point to a file located on the root volume.
So, "3" is a combination of sleep and hibernation where it's supposed to wake from memory like a regular sleep, but also dumps the memory to disk in case the battery dies. From my experience when I sleep for more than a few hours I consistently experienced slow wakes. I assume this is because it's waking from disk, rather than memory.
I almost never sleep my machine until the battery dies, and when I do I certainly don't leave unsaved work lying around. I just want good old-fashioned sleep.
nate@nirvana ~> sudo pmset -a hibernatemode 0
Seems to have done the trick. Sweet!