Hi Daniele,
Search the mailinglist for cpu stuck and you'll find more threads about it and the
only answer yet, stick to kernel 3.6.10. Anything higher will cause random cpu stuck on
boot in combo with multipath. Some bugreports seem to indicate that energy saving mode ( c
states) is responsible but can't confirm this but you can try setting bios to max
performance, no powersave states.
Regards,
Joop
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Sent from my Android tablet with K-9 Mail. Please excuse my brevity.