I have two machines sitting here, one with an OWC SSD that I put in myself, one with an SSD that came from Apple.
On the older machine I had issues with sleep: the screen goes to sleep but the next phase of sleep where the motherboard, hard disk and radios go to sleep would not kick in unless I actively chose sleep from the Apple menu or closed the lid (screen). If I walk away from the machine, lid up the LED light by the latch is on but does not pulse. Close the lid, it pulses.
Pulsing = sleep.
On the brand new machine with Apple-supplied SSD the exact same thing happens: the machine does not go into deep sleep on its own without me doing one of many things to force it: Apple menu, power button, etc.
This makes sense, there is no spinning hard disk to spin down. One thing many considering SSD or talking about MacBook Airs don’t seem to realize is that an SSD (as opposed to the soldered on flash memory of a MacBook Air) is mimicking a hard disk: it’s in the same packaging and is a replacement for a hard disk in a computer. So, until the system knows the difference, there might be issues like this.
However, there are other things that get turned off when a machine goes to sleep and you can test this yourself if you have a wireless (bluetooth) mouse.
Leave the lid up but use the Apple menu to put the machine to sleep. Move a bluetooth mouse and the machine doesn’t wake up. This means the bluetooth radio is turned off. Same with wifi: deep sleep turns the radio off. Wake the machine up by hitting the keyboard and the wifi menu (the bars) may actually search for the network. You know the machine was sleeping if this happens.
On either of my machines: the old MacBook Pro with OWC SSD or new MacBook Pro with Apple-supplied SSD if the machine is left on its own, lid up, moving a bluetooth (magic) mouse will wake the screen up and the wifi menu is all lit up, it never turned off.
So, in case you’re thinking that it’s only third party SSD upgrades that are messing with the out of the box sleep modes on MacBook Pros, it’s not, Apple’s SSDs are doing it too.
And, “real” sleep is meaningful in that it turns the computer’s radios off and in so doing saves battery life.
I’m going to be calling AppleCare next week, less to complain, more to find out of they’re aware of this and what they’re doing about it. My guess is Lion will fix this although if enough people report about it maybe it will be fixed in a Snow Leopard update.
Anyone out there with a new MacBook Air who cares to comment I’d love to hear from you. The next time I’m in an Apple store I’ll test a MacBook Air to see about this, it’s an easy experiment to do.
This is definitely not a deal breaker on SSDs and it supports attempting to save money with SSD suppliers other than Apple. But, those using machines with SSDs and possibly MacBook Airs with soldered on flash memory, make sure your machine is really sleeping when you think its sleeping.