1 2 3 4 Previous Next 46 Replies Latest reply: Apr 14, 2012 7:41 AM by fabian.zeindl
billimek Level 1 Level 1 (0 points)

2011 MacBook Air 13” model number A1369

 

 

The issue: every time the battery drains empty and the device automatically shuts off, it will not properly power-on after being charged.  The display backlight is active (and apple logo on the rear is illuminated) although the screen is blank.  The machine doesn’t respond to any command or action.  The machine will not respond to ping requests and does not appear to attempt to join the network according to the Airport logs.  Closing the clamshell and re-openning does not appear to make any difference.  The only action that yields any response is to hold the power button until it turns off and then turn it back on again.  This has happened 100% of the time since the MacBook Air was purchased. This behavior does not happen with the 2009 MacBook pro also running OSX Lion. 

 

pmset -g output:

Active Profiles:

Battery Power           -1*

AC Power                -1

Currently in use:

standbydelay   4200

standby        1

halfdim        1

panicrestart   15

hibernatefile  /var/vm/sleepimage

disksleep      10

sleep          10

hibernatemode  3

ttyskeepawake  1

displaysleep   5

acwake         0

lidwake        1

 

 

pmset -g log output of problem situation:

* Domain: sleep

- Message: Sleep: Success - BATT 0 - Low Power Sleep

- Time: 8/13/11 10:32:55 PM EDT

- Signature: Success

- UUID: 79B0FD75-93BF-4F54-9206-F88EFDD9539A

- Result: Success

- Sleep count : 0

 

* Domain: sleep

- Message: Sleep: Platform Failure - AC 82

- Time: 8/13/11 11:58:45 PM EDT

- Signature: Platform Failure

- UUID: 399B3402-C3A6-451B-B5AC-60CF6CD5176F

- Result: Failure

 

Observations:

  • FileVault is enabled
  • This issue does not seem to occur when the device enters the ‘hibernation’ state after sleeping for an extended-period of time

 

 

Actions taken (with no resolution yet):

  • SMC reset (multiple times)
  • PRAM reset
  • Set main HD (“Macintosh HD”) as Startup Disk
  • Complete reinstall of OSX Lion

 

Any advice?


MacBook Air, Mac OS X (10.7), mid-2011 13" 1.7GHz i5 model
  • 1. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    axelbauer Level 1 Level 1 (0 points)

    Same here. Seems to be connected to FileFault full disk encryption in some way,

    also i did not try without encryption.

     

    Note that the pmset(1) utility has new options, some of which are a bit confusing for me:

     

         - standby

         - standbydelay

         - destroyfvkeyonstandby

     

    with "standby" set to 1 hibernation should start after sleeping "standbydelay" seconds.

     

    how does standby relate to "hibernationmodes" ? I assume it makes only sense in combination with

    hibernationmode set to 3.

     

    "destroyfvkeyonstandby" should control handling of fv keys after wakup. I guess with this set to 1,

    you will always have to enter a password after wake, even if "ask for password after sleep" is disabled

    somewhere in the security preferences (and the credentials won't be anywhere in ram or on disk).

     

    This is not a fix, but maybe there is a workaround playing with these values. Maybe setting both sleep (automatic sleep timer) and standbydelay to a  low value would be an idea, as the power outage immediate hibernation would be unlikely to happen.

     

    axel

  • 2. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    billimek Level 1 Level 1 (0 points)

    For those of you having this issue:  Do you happen to run screen or multiple terminal sessions?  The last time my battery drained and the macbook air went to sleep, it actually woke up correctly after being charged.  The only difference that I know of was that I was not running screen with a lot of terminal sessions.

     

    I'm pretty sure that all of the other times the problem occured, I was running screen and/or multiple terminal sessions.

     

    I bring this up because there is another bug with OS X 10.7 in which a kernel panic occurs 100% of the time during a shutdown/restart and screen and/or multiple terminals are logged in.  The kernel panic has something to do with ttys.

  • 3. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    axelbauer Level 1 Level 1 (0 points)

    Interesting. I am usually having pseudo ttys with multiple terminal windows open, yes.

    Never seen any kernel panic though.

  • 4. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    vonkas Level 1 Level 1 (0 points)

    Have the same issue with MBA 11" 2011 - 100% reporoducible. It matters not if you have apps open or not. To provoke the bug, simply leave your MBA sleeping until battery is drained. No more wake up after charging - hard reset required. The condition has not changed after the latest firmware patch (as of 19 Sept 11).

  • 5. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    mrfett Level 2 Level 2 (195 points)

    same problem, 2011 11" encrypted drive. Terminal is often running but only a single session. always have to do a hard restart when i let the battery drain.

  • 6. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    cmeid Level 1 Level 1 (0 points)

    Pardon the thread necromancy, but I have exactly the same problem, 100% reproducable.

     

    I also generally have multiple terminal sessions open, but have tested with all applications closed. I tested again now just to be sure. (Wasn't sure if I tested with terminal closed. Term is like finder to me, it's always running.)

     

    I rarely run screen, but always have multiple ssh sessions with different -D values into different networks open.

     

    Have any of you been able to make any headway?

  • 7. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    cmeid Level 1 Level 1 (0 points)

    Do you have any further info on that kernel panic? I'm not finding anything, but may be using the wrong search terms.

  • 8. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    mike.lwrnc Level 1 Level 1 (0 points)

    I also have whole disk encryption turned on and experience the same issue (waking from sleep after draining the battery then plugging in yields a black backlit screen). This occurs every time, regardless of whether I have any terminal.app running or not.

     

    I've lost work a couple times due to this, but I have sensitive data on my computer and really can't turn off whole disk encryption, so I really hope Apple fixes this soon.

  • 9. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    vonkas Level 1 Level 1 (0 points)

    I re-affirm the findings of mike.lwrnc, axelbauer, billimek and my own, but I have bumped into a work-around. Before attempting to start the MBA, leave the charger active for 10-15 minutes. Subsequently you can boot with the power button, this works as expected. However, I still regard this bahaviour as a bug as there is no indication of the condition nor are there instructions as to managing this situation. Apple, FIX IT!

  • 10. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    triumph1337 Level 1 Level 1 (0 points)

    I have the exact same issue 100% reproducible BUT I also know how to exercise the bug without needing to run down the battery.  Simply do sudo pmset -a destroyfvkeyonstandby 1 hibernatemode 25 then remove the power cord, close the clamshell, plug the power cord back in so it charges for a second, then open the clamshell.  You will be in the same blank screen state as if you had let the battery run out. 

     

    hibernatemode 25 basically just tells the computer to go into hibernate mode instead of sleep mode wheenver you close the laptop. 

     

    destroyfvkeyonstandby tells the computer to power down the ram as soon as it enter hibernate mode.

     

    This problem is way worse than any of you suspect.  In all probability the system was intentionally broken in order to provide a backdoor into FV2.  Let me explain:

     

    It's impossible to achieve a secure FV2 system without using the following settings:

     

    sudo pmset -a destroyfvkeyonstandby 1 hibernatemode 25

     

    because otherwise what will happen is your FV key will be stored in RAM during both sleep and hibernate states.  That means if a bad guy steals your laptop while it's in sleep or hibernate state he's then free to take an unlimited amount of time to attack it.  He will be able to retrieve the key from ram as DEMONSTRATED LIVE a few months ago at a security confrence.  The tools to preform the attack to retreive the key along with a detailed writeup are availble here:

     

    http://www.frameloss.org/2011/09/18/firewire-attacks-against-mac-os-lion-filevau lt-2-encryption/

     

    So at the risk of repeating myself... the conclusion is it's impossible to have a secure FV2 MBA system because of this bug.  I suspect it's a conspiracy because it's too convenient of a bug..

     

    apple has the fV2 system insecure by default (key stored in ram by default) and then apple happens to have a bug that prevents you from flushing that key then hibernating which would be the secure way to do it. Too much of a coincidence. 

  • 11. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    vonkas Level 1 Level 1 (0 points)

    triumph1337 said: ..Too much of a coincidence.

     

    this might explain Apple silence on the issue!

  • 12. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    cmeid Level 1 Level 1 (0 points)

    vonkas wrote:

     

    triumph1337 said: ..Too much of a coincidence.

     

    this might explain Apple silence on the issue!

     

    Well, it wouldn't explain why Apple doesn't make the machine able to wake from sleep.

  • 13. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    Cinos2000 Level 1 Level 1 (15 points)

    I had that twice but I found a way to put it on again; hold the power button for 2 seconds or until you see the cursor. This works for me

     

    I don't know why it does that but it must be the same with every 2011 MBA. Apple needs to find a way to fix this.

  • 14. Re: MBA fails to wake (Platform Failure) after entering Low Power Sleep state
    Cinos2000 Level 1 Level 1 (15 points)

    And the PRAM resets or smc resets will only work if the computer is actually OFF, not on sleep

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