[Bug 80651] New: [intel_pstate] pstate settings are lost during suspend/resume cycle

[Bug 80651] New: [intel_pstate] pstate settings are lost during suspend/resume cycle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=80651

            Bug ID: 80651
           Summary: [intel_pstate] pstate settings are lost during
                    suspend/resume cycle
           Product: Power Management
           Version: 2.5
    Kernel Version: 3.15.6
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
          Assignee: cpufreq@vger.kernel.org
          Reporter: liquid.acid@gmx.net
        Regression: No

Created attachment 143431
  --> https://bugzilla.kernel.org/attachment.cgi?id=143431&action=edit
dmesg output

Hello,

the patches that went into 3.15.6 made the intel_pstate driver finally useable
for me. At least as long as I don't suspend/resume the system.

After resume the multiplicator is locked to the highest one. I have to change
min_perf_pct and max_perf_pct to some other values and then back to restore the
behaviour before the suspend.

CPU is a Haswell / i7-4700HQ.

With best wishes,
Tobias

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[Bug 80651] [intel_pstate] pstate settings are lost during suspend/resume cycle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=80651

Tobias Jakobi <liquid.acid@gmx.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #143431|application/octet-stream    |text/plain
          mime type|                            |

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[Bug 80651] [intel_pstate] pstate settings are lost during suspend/resume cycle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=80651

--- Comment #1 from Tobias Jakobi <liquid.acid@gmx.net> ---
Created attachment 143441
  --> https://bugzilla.kernel.org/attachment.cgi?id=143441&action=edit
kernel config

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[Bug 80651] [intel_pstate] pstate settings are lost during suspend/resume cycle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=80651

--- Comment #2 from Tobias Jakobi <liquid.acid@gmx.net> ---
Created attachment 143451
  --> https://bugzilla.kernel.org/attachment.cgi?id=143451&action=edit
i7z output

This is some generic output by i7z when the cpu is in 'low' perf mode
(max_perf_pct=55, min_perf_pct=23, no_turbo=1).

After resume, while these settings above didn't change, the multiplicator
sticks to around 24.5.

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[Bug 80651] [intel_pstate] pstate settings are lost during suspend/resume cycle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=80651

--- Comment #3 from Tobias Jakobi <liquid.acid@gmx.net> ---
I realized that changing and restoring the values doesn't quite do it. The
issue seems related to the fact that I usually have two of the four cores
disabled (by offlining the cpus that are associated to core ids 2 and 3).

I have to bring all cores online again, then set the values, and then I can
take core 2 and 3 offline again.

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[Bug 80651] [intel_pstate] pstate settings are lost during suspend/resume cycle

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=80651

Lan Tianyu <tianyu.lan@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |tianyu.lan@intel.com
           Assignee|cpufreq@vger.kernel.org     |dirk.brandewie@gmail.com

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