Hello,There was a patch applied in 2014 that added the Atom CPU model (54 / 0x36) to the list of CPUs that support intel_idle:
http://marc.info/?l=linux-pm&m=139068510624936&w=2Unfortunately, I believe it has caused me quite a lot of pain today due to some machines not supporting Intel Idle correctly.
See #816751 for details. nick.