XO-1.75/Kernel/Issues
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hang, mmp2-pcm-audio mmp2-pcm-audio.0: resume
No FIQ. No SysRq. Last console message mmp2-pcm-audio mmp2-pcm-audio.0: resume. Always preceeded by a PM: Some devices failed to suspend.
Jon Nettleton says known problem. Caused by interrupted suspend, and during the unwind of the resume it hangs.
Can be worked around by removing the audio driver from the kernel.
Disabling runin-sound has no effect.
Seen within half an hour if SUS_TIME is set to 3000. Rarely or never seen if SUS_TIME is set to 10000.
Theory: once a suspend takes too long, the RTC alarm goes off before suspend has finished, and the suspend is interrupted, leading to this issue.