On Sun, Jun 12, 2011 at 06:20:55PM +0100, José Matos wrote:
> On Sunday 12 June 2011 16:56:33 Pasi Kärkkäinen wrote:
> > Hello list,
> > Any tips how to debug why laptop CPU temperature is around 30 degrees
> > celsius higher on Fedora 14 or Fedora 15 compared to Windows 7 ? Both
> > Linux and Windows were idle when measuring..
> > I tried both Fedora 14 (Linux 2.6.35) and Fedora 15 (Linux 2.6.38).
> > Laptop specs:
> > - HP Elitebook 8530p.
> > - CPU: Mobile Intel Core 2 Duo T9600 (Penryn).
> > Results:
> > - Windows: CPU is 57 - 65 celsius when idle.
> > - Fedora/Linux: CPU is 85 - 95 celsius when idle.
> > The laptop definitely feels much more hot when in Linux
> > and sometimes shuts down with thermal overheating warning.
> > That overheating problem never happens in Windows.
> > Checking "powertop" in Linux shows the CPU is mostly running
> > with the lowest MHz available. Not much "idle" time though..
> > I was using "Core Temp" in Windows and /sys ACPI interface in Linux:
> > # cat /sys/bus/acpi/devices/LNXTHERM:03/thermal_zone/temp
> > 86000
> > # cat /sys/bus/acpi/devices/LNXTHERM:03/path
> > \_TZ_.CPUZ
> > "acpi -t" also shows the same CPU temperature.
> > Fedora 15 Linux 2.6.38 dmesg here:
> > http://pasik.reaktio.net/fedora/f15/cputemp/dmesg-laptop-f15.txt
> > Any ideas how to track what's causing that? All suggestions welcome!
> > Thanks,
> > -- Pasi
> What is the graphics card?
It's ATI radeon RV635. Do you have the same graphics card?
> I am running this from a laptop of the same model and I see:
> $ sensors
> Adapter: Virtual device
> temp1: +30.0°C (crit = +115.0°C)
> temp2: +50.0°C (crit = +105.0°C)
> temp3: +26.6°C (crit = +112.0°C)
> temp4: +58.0°C (crit = +112.0°C)
> temp5: +46.0°C (crit = +90.0°C)
> temp6: +16.0°C (crit = +112.0°C)
So your CPU temp is what it should be..
> Adapter: PCI adapter
> temp1: +58.0°C
> Adapter: ISA adapter
> Core 0: +51.0°C (high = +105.0°C, crit = +105.0°C)
> Adapter: ISA adapter
> Core 1: +50.0°C (high = +105.0°C, crit = +105.0°C)
> The only thing I have done in order to cool down graphics card was to run:
> # echo mid > /sys/class/drm/card0/device/power_profile
Oh, I wasn't aware of this. I'll try and see if that makes a difference.
> instead of the default value auto (that alternates between mid (middle) and
> high) for the graphics card.
> Definitivily I saw an improvement between F14 and F15.
> Running the graphics card power profile as low brings the temperature even
> lower (at the expense of some slower window updates).
> FWIW I never had a problem with overheating.
Ok, good to know.
> Regarding the comparison with windows (win.. what?) ;-) this computer came
> with freedos installed so no such luck here. :-D
Thanks for the reply!
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