Re: Regression in 4.8 - CPU speed set very low

From	Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Newsgroups	linux.kernel
Subject	Re: Regression in 4.8 - CPU speed set very low
Date	2016-09-29 18:00 +0200
Message-ID	<smLUB-5YJ-7@gated-at.bofh.it> (permalink)
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On Thu, 2016-09-29 at 14:19 +0200, Rafael J. Wysocki wrote:

[...]

> > My laptop was inadvertently put to sleep while I was gone. I forgot
> > to leave a 
> > note for my wife and she quieted the noisy cpu fan. :)
> It looks like in 4.8-rc we made a change that caused the "high" trip
> point to
> be acted on.
This high trip point we don't expose in thermal subsystem (the thermal
 zone dump didn't show this anywhere as a trip). This is exposed by
core-dts driver only. This is the point BIOS is supposed to act, I
guess that's why you are seeing 50% clock modulation. 


Are you running thermald 

What is?
# ps -e | grep thermald


> 
> Srinivas, Rui, do you recall what that can be?
> 
> One more question (I think I asked it previously): In the failing
> case
> (4.8-rc1 and later), when the frequency drops down to the 400 MHz,
> does it
> ever go back higher or is it stuck at that level forever?
> 
> In any case, it may help to file a bug at bugzilla.kernel.org against
> CPU/thermal or similar and let me know the bug number.  We'll need to
> collect some tracepoint data to debug this and some place to put them
> into for easy reference.
Yes, this is good idea.

Thanks,
Srinivas

Thread

Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-24 04:50 +0200
  Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-09-26 13:40 +0200
    Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-26 18:20 +0200
      Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-09-26 23:10 +0200
        Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-26 23:30 +0200
          Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rafael@kernel.org> - 2016-09-26 23:40 +0200
            Re: Regression in 4.8 - CPU speed set very low Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-09-26 23:50 +0200
              Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-27 00:20 +0200
            Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-27 00:20 +0200
              Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rafael@kernel.org> - 2016-09-27 00:20 +0200
                Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-27 02:00 +0200
                Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rafael@kernel.org> - 2016-09-27 02:30 +0200
                Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-27 02:50 +0200
                Re: Regression in 4.8 - CPU speed set very low Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-09-27 03:40 +0200
                Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-27 05:00 +0200
                RE: Regression in 4.8 - CPU speed set very low "Doug Smythies" <dsmythies@telus.net> - 2016-09-27 05:20 +0200
                Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-27 10:50 +0200
                Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rafael@kernel.org> - 2016-09-27 13:50 +0200
                Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-29 04:30 +0200
                Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-09-29 14:20 +0200
                Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-29 17:10 +0200
                Re: Regression in 4.8 - CPU speed set very low Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-09-29 18:00 +0200
                Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-29 18:30 +0200
                Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-09-29 22:50 +0200
                Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-10-01 00:00 +0200
          Re: Regression in 4.8 - CPU speed set very low lsorense@csclub.uwaterloo.ca (Lennart Sorensen) - 2016-09-27 17:00 +0200
            Re: Regression in 4.8 - CPU speed set very low Larry Finger <Larry.Finger@lwfinger.net> - 2016-09-29 04:30 +0200
              Re: Regression in 4.8 - CPU speed set very low lsorense@csclub.uwaterloo.ca (Lennart Sorensen) - 2016-09-29 16:20 +0200
        Re: Regression in 4.8 - CPU speed set very low Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-09-26 23:30 +0200
          Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rafael@kernel.org> - 2016-09-26 23:40 +0200
            Re: Regression in 4.8 - CPU speed set very low Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-09-26 23:50 +0200
              Re: Regression in 4.8 - CPU speed set very low "Rafael J. Wysocki" <rafael@kernel.org> - 2016-09-26 23:50 +0200

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