On Sat, Sep 14, 2013 at 9:26 PM, Nicolas Thierry-Mieg <
Nicolas.Thierry-Mieg@xxxxxxx> wrote:
> Ned Slider wrote:
> > On 14/09/13 16:23, Krishnan V wrote:
> >> Hi,
> >> I have an acer 5738g laptop on which i tried out the centos6.4 live
> CD.
> >> The laptop feels noticable hotter and i check the temperature using
> >> something like cat /proc/acpi/thermal_zone/. The temperatures are around
> >> 57-60 degrees when the laptop is just idling, ie, just the desktop and
> the
> >> terminal window open. I install lm_sensors using yum and it installs
> >> successfully, but there is no noticable reduction in temperature. I have
> >> faced this same problem using different varities of gnu/linux
> >> distributions: slackware, lubuntu, mandriva and now centos. By a freak
> >> chance, i had a chance to run RHEL 5.4 and to my great surprise, the
> >> temperature at idling was 43, similar to Windows(which came as
> default). In
> >> fact, the temperature control by rhel was what made me think of trying
> >> centos. I tried the lm_sensors configuration on rhel and it was not even
> >> able to load the correct modules, yet the temperature control was
> better.
> >> Now, i am not sure if lmsensors are for detecting temperatures only but
> >> also for cotrolling temperature.
> >
> > lm_sensors is indeed for monitoring only. Further, different drivers
> > will report different temps so you need to be very careful you are not
> > comparing apples with oranges. Even the same driver (e.g, coretemp) can
> > report different temps depending if it's an old version in el5 vs a
> > newer version in el6. Temperatures are generally relative so monitoring
> > is useful to see if the temp goes up or down, but don't necessarily take
> > the values as absolute.
>
> it may also depend on your GPU and graphics driver. Do you have a
> discrete GPU in your laptop? If yes, the proprietary driver may help by
> underclocking the GPU when it doesn't impact performance.
>
Yes, I have a separate graphics card. It is ATI Radeon.
>
> For example if you have an nvidia GPU, installing the correct nvidia
> driver will do this if your card supports it.
> Set up elrepo and install nvidia-detect, it will tell you which driver
> to install.
> http://elrepo.org/tiki/nvidia-detect
> Then install it, and run nvidia-settings to see the Powermizer options.
>
I will try for ATI Radeon and try this. Thank you.
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