[sf-lug] Overheating and CPU throttling

[maestro]

np...
good hunting...



\'m'/


message ends.
__________________

On Sun, Jan 20, 2019 at 11:45 PM Josh Greenland <joshuag1 at mindspring.com>
wrote:

> I didn't known about laptop-mode-tools until I saw your email.
> (Archlinux's packaging for powertop didn't suggest it and it wasn't in
> Arch's repositories (though it was in it's AUR).)   Thank you for the
> suggestion.  I'm going to install it and see what I can get it to do.
>
> maestro wrote:
>
> Josh Greenland;
> do you also use the suggested [with install of powertop] package
> laptop-mode-tools?
> thank you...
>
>
> message ends.
> __________________
>
>
> /'m'/
>
>
>
> On Sun, Jan 13, 2019 at 5:55 AM Josh Greenland <joshuag1 at mindspring.com>
> wrote:
>
>> Akkana Peck wrote:
>> > My Thinkpad X201 laptop has developed an overheating problem.
>> > Randomly, when I'm doing something lengthy and CPU intensive
>> > like building Firefox, it will shut down without warning. Afterward,
>> > I have messages like this in /var/log/kern.log:
>> > thermal_zone0: critical temperature reached (100 C), shutting down
>> >
>> > I've found lots of pages with people with similar problems,
>> > getting lots of responses like "Any modern Linux computer should
>> > automatically throttle its CPU when temperatures get high". No one
>> > explains how this automatic throttling is supposed to happen, or how
>> > to enable it if it's not happening, or what "modern" means (is it
>> > the CPU that needs to be modern? The BIOS? The kernel? How modern?)
>> >
>> > What I'd really like is a daemon or kernel setting that monitors
>> > the temperature and, if it exceeds max (well before it reaches
>> > critical), scales down the CPU frequency, or kills or (preferably)
>> > suspends whatever process is running away with the CPU, or suspends
>> > the machine rather than shutting down. I have started down the path
>> > of writing such a daemon, but it's complicated by not wanting to
>> > suspend certain processes like X even if their CPU usage looks high
>> > due to some other app. And it's hard to believe Linux doesn't
>> > already offer a solution to this problem.
>> >
>> > More system details:
>> >
>> > This X201 has been my main workhorse for 5+ years and never had
>> > temperature problems until a few weeks ago. I have opened it
>> > and don't see any dust bunnies around the fan.
>> >
>> > Processor is a quad-core Intel(R) Core(TM) i5 CPU M 540 @ 2.53GH.
>> > Distro is Debian Testing. Kernel was 4.18.0-2-amd64, which I was
>> > stuck on because of a modeset bug in 4.18.0-3, but it looks like
>> > 4.19.0-1 has fixed it so now I've upgraded.
>> >
>> > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor is
>> > "ondemand", if that matters; though it doesn't seem from
>> > https://www.kernel.org/doc/Documentation/cpu-freq/governors.txt
>> > like any of the governors look at temperature at all.
>> >
>> > Any suggestions? Any good articles I could read on how this
>> > scaling/governor/thermal/cpufreq stuff is supposed to work?
>> >
>> >          ...Akkana
>>
>> It might not hurt to install the powertop utility and use it to check
>> power usage, especially of hardware resources that you don't use, and to
>> use it to turn on all powersaving capabilities on your system.  It's
>> made a huge difference on a hot-running system that I use, and has
>> helped on an older Thinkpad that I spend a lot of time on.
>>
>> You can also use powertop to see what hardware resources stop using
>> power when you unload their modules.
>>
>> I also use the cpupower utility, which has allowed me to put maximum
>> limits on CPU frequency when my systems run too hot -- most often during
>> compiles.
>>
>> I use the sensors utility from the lm_sensors package and i7z to keep an
>> eye on temperature and fan speed.
>>
>> powertop, cpupower, lm_sensors and i7z are all packages on Archlinux's
>> respositories.  I don't know about their availability on other distros.
>>
>> '
>> There is also thermald, a daemon software that may have been designed to
>> do what you want.
>>
>>
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