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Thread: Suspend/Resume freeze on MacBookAir4,1 Ubuntu 14.04 LTS

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  1. #1
    Join Date
    May 2014

    Suspend/Resume freeze on MacBookAir4,1 Ubuntu 14.04 LTS

    Sorry if this has been mentioned already, I have attempted a few searches.

    I'm running Trusty on my MacBook Air Mid 2011 (4,1) and roughly 1 in 5 times that I put it to sleep, it won't wake up again. If I then force a power off (holding the power button) and start it back up, it offers to send a crash report regarding a suspend/resume KernelOops error.

    I have tried the latest Trusty mainline kernel (3.15rc2), no difference

    However without X running (sudo service lightdm stop, log in from the text console) if I sleep it from there, which of course requires a command:
    echo "mem" | tee /sys/power/state
    It's fine. I have done countless suspend/resume cycles with no problems in text mode, although once or twice it could only be woken up from a tap of the power button, while the rest of the time any key will wake it. I'm not sure if it's related at all.

    My instincts point me towards i915 / the xorg intel driver. Just wondering if there's anything else I can try. I have tried changing the AccelMode to UXA instead of SNA (as one would try in Arch but that didn't help either.

    Edit: to be exact it hangs on sleep, not on resume. The keyboard stays lit.
    Edit 2: also tried setting NoAccel on the intel driver, and i915.semaphores=1 as a boot parameter.
    Edit 3: tried this kernel here: - interestingly, this one freezes with the screen on and showing the last frame before it froze. But still freezes.
    Edit 4: tried the latest graphics stack here
    I'm completely out of ideas Frustrating... I have Ubuntu set up 99% perfectly, if not for this massive showstopper that will probably end in me going back to OS X
    Last edited by cloudane2; May 16th, 2014 at 11:52 AM.


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