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Re: Issue with disabling Intel turbo boost via systemd


On Sun, Jun 07, 2020 at 12:01:58AM +0200, l0f4r0@tuta.io wrote:
> Hi Reco,
> Thank you for your feedback.
> 6 juin 2020 à 19:55 de recoverym4n@enotuniq.net:
> > On Sat, Jun 06, 2020 at 05:39:00PM +0200, l0f4r0@tuta.io wrote:
> >
> >> I have frequent warning/4 entries in my journalctl like this one (dozens/day):
> >> kernel: mce: CPU[X]: Package temperature above threshold, cpu clock throttled
> >>
> >> So I decided some time ago to create the following systemd service
> >> (/etc/systemd/system/disable-turbo-boost.service) in order to deactivate my
> >> Intel processor turbo boost:
> >>
> > *Shrugs*. "apt-get install sysfsutils" is the universal solution to such problems.
> >
> I've just installed this  package.
> Am I supposed to add now "/sys/devices/system/cpu/intel_pstate/no_turbo=1" in /etc/sysfs.conf?

No, you're supposed to add this line:

devices/system/cpu/intel_pstate/no_turbo = 1

Leading "/sys" is always omitted in sysfsutils.

> Or maybe via a specific file in /etc/sysfs.d/ instead (I presume this directory is setup so changes are not overwritten during an upgrade)?

Whatever suits you. End result will be the same.

> I hope it's going to work because it seems that sysfs is sometimes triggered too late to be taken into account correctly, on Ubuntu 12.04.3 at least (https://bugs.launchpad.net/ubuntu/+source/sysfsutils/+bug/955918).
> I'm not used at all to systool and I'm very suprised to see there is almost no documentation/tutorial about it on the internet.
> People probably probe /sys directly to get what they are looking for...
> >> Do you have an idea why my turbo boost was not active anymore please?
> >>
> > It's possible that you have laptop-mode-tools package installed. Among
> > with the other things, it tries to control this particular sysfs knob.
> > Search for /etc/laptop-mode/conf.d/intel_pstate.conf, ensure that
> >
> You get it right, I had laptop-mode-tools installed indeed! Well done ;)You know what, I've just uninstalled this package.



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