Comment 116 for bug 22336

The fans should come on first. It should never underclock the CPU except if
the CPU is idle, or as a last resort.

--- Alejandro Zanotti <email address hidden> wrote:

> The thing here I think is that when CPU throtles up due to processor
> needs,
> and temperature rises... it should stop underclock if temperature rises
> to
> much and come closer to critical temp, until temps comes down... but it
> doesnt.
> Thats the thing i think
>
> 2007/4/17, Paul Harrison <email address hidden>:
> >
> > I think some people are barking up the wrong tree with this one. There
> > is a problem with the CPU overheating, but it has little or nothing to
> > do with throttling, as the complaints are about the CPU overheating
> when
> > CPU usage is *supposed* to be high (ie compiling applications, etc)
> >
> > Throttling is a technique meant to be used during periods of *low* CPU
> > usage. The purpose is to reduce the power consumption of the CPU when
> it
> > isn't doing much. You're not supposed to throttle the CPU when it's
> > doing a lot of work except in a dire emergency, because that defeats
> the
> > purpose of having a fast CPU in the first place. A CPU that's throttled
> > whenever it's doing a lot of work is essentially one that may feel
> > slightly more responsive than an equivalent machine with a CPU that
> runs
> > at the slower speed by default, but is otherwise just as poorly
> > performing.
> >
> > I have a Thinkpad T60. Until a couple of weeks ago, I was running
> Debian
> > sarge with a 2.6.16 kernel. I can tell you what's different between it
> > and the Feisty install I have today: on the Debian machine, when the
> > fans needed to come on full blast, they did. On the Feisty install,
> they
> > don't. Even typing "# echo level 7 > /proc/acpi/ibm/fan" to force the
> > fans to their highest "supported" speed is not enough to actually get
> > them to go at their documented rate. They certainly aren't making the
> > same amount of noise. The only way I can permanently prevent my laptop
> > from overheating is to override the rate control altogether with "#
> echo
> > level disengaged > /proc/acpi/ibm/fan" which does get the fans up to
> > full speed, but makes it permanent (whereas under Debian, the fans
> would
> > only go to full speed if the laptop really was doing a lot of work. The
> > various OpenGL screensavers and Unreal Tournament would do that.)
> >
> > If "level 7" fans meant the same thing under Feisty as it did under
> > Sarge, I don't think there'd be a problem.
> >
> > I can manually enable throttling and have done so, but the result has
> > been somewhat unusable: whenever I start anything from installing
> > packages (gzip uses CPU...) to compiling a large program, the CPU speed
> > plummets to something barely usable. I'm failing to see the point. I
> can
> > see using it if the CPU approaches an unsafe temperature even when fans
> > are on full blast (essentially as a last resort, to save the system
> from
> > either burning up or turning off), but not if simply bumping up the fan
> > speed would do the job.
> >
> > --
> > CPU overheats during high usage "throttling <not supported>"
> > https://bugs.launchpad.net/bugs/22336
> > You received this bug notification because you are a direct subscriber
> > of the bug.
> >
>
>
> --
> Alejandro Zanotti
>
-------------------------------------------------------------------------------
> "Hay 10 tipos de personas, las que saben leer binario y las que no"
>
> --
> CPU overheats during high usage "throttling <not supported>"
> https://bugs.launchpad.net/bugs/22336
> You received this bug notification because you are a direct subscriber
> of the bug.
>

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