Messages in this thread | | | Subject | Re: Regression in 4.8 - CPU speed set very low | From | Srinivas Pandruvada <> | Date | Thu, 29 Sep 2016 08:56:16 -0700 |
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On Thu, 2016-09-29 at 14:19 +0200, Rafael J. Wysocki wrote:
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> > 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
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