C1E auto-promotion suspend/resume

From	Andy Lutomirski <luto@amacapital.net>
Newsgroups	linux.kernel
Subject	C1E auto-promotion suspend/resume
Date	2016-03-14 02:40 +0100
Message-ID	<rcpEe-5dH-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hi-

By BIOS (1.2.3 on a Dell XPS 13 9350) seems to want to enable C1E
auto-promotion (ugh!), which results in this difference across
suspend/resume according to turbostat:

-cpu3: MSR_IA32_POWER_CTL: 0x0024005d (C1E auto-promotion: DISabled)
+cpu3: MSR_IA32_POWER_CTL: 0x0024005f (C1E auto-promotion: ENabled)

Should intel_idle learn to re-disable idle promotion on resume?

--Andy

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C1E auto-promotion suspend/resume Andy Lutomirski <luto@amacapital.net> - 2016-03-14 02:40 +0100
  RE: C1E auto-promotion suspend/resume "Brown, Len" <len.brown@intel.com> - 2016-03-14 05:40 +0100
    [PATCH 0/4] intel_idle: Improve MSR fixup resume handling Andy Lutomirski <luto@kernel.org> - 2016-03-14 05:50 +0100
      [PATCH 3/4] intel_idle: Fix MSRs after resume Andy Lutomirski <luto@kernel.org> - 2016-03-14 05:50 +0100
      [PATCH 4/4] intel_idle: Move BYT/CHT auto-demotion fixup into fix_this_cpu Andy Lutomirski <luto@kernel.org> - 2016-03-14 05:50 +0100
      [PATCH 1/4] intel_idle: Consolidate auto-promotion/auto-demotion fixups Andy Lutomirski <luto@kernel.org> - 2016-03-14 05:50 +0100
      [PATCH 2/4] intel_idle: Remove a broadcast MSR fixup at boot Andy Lutomirski <luto@kernel.org> - 2016-03-14 05:50 +0100
    Re: C1E auto-promotion suspend/resume Andy Lutomirski <luto@amacapital.net> - 2016-03-14 06:30 +0100

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