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[Bug 1559918] Re: [Bug]SKL-H boot hang when c8+c9+c10 enabled by intel_idle driver

 

** Tags added: originate-from-1550112 somerville

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Title:
  [Bug]SKL-H boot hang when c8+c9+c10 enabled by intel_idle driver

Status in HWE Next:
  New
Status in intel:
  New
Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Wily:
  In Progress
Status in linux source package in Xenial:
  Fix Committed

Bug description:
  System will hang immediately with 4.3 kernel above on SKL-H GT4 sdv.
  The workaround for this is intel_idle.max_cstate=6/7 boot option. 
  But intel_idle.max_cstate=8 will generate system hang 

  Bugzilla:
  https://bugzilla.kernel.org/show_bug.cgi?id=109081
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1550194

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