This is still happening. I was hoping my PCIe hotplug bug+fix might have
been related, but no it happened just now after that fix.
Since Ingo's latency trace patches lock up the machine on resume,
the next thing I'll try instead is to re-enable CONFIG_IRQBALANCE=y.
I think that I turned that flag off at around the same time as this
problem began, maybe they're related (?).
I did notice that CONFIG_IRQBALANCE=y *is* necessary to keep my myth box
from having 1-second audio dropouts (22.214.171.124) during playback, so maybe
that same 1-second lockout is happening on this box as well (?).