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?

I am running this from a laptop of the same model and I see:

$ sensors
acpitz-virtual-0
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)

radeon-pci-0100
Adapter: PCI adapter
temp1: +58.0°C

coretemp-isa-0000
Adapter: ISA adapter
Core 0: +51.0°C (high = +105.0°C, crit = +105.0°C)

coretemp-isa-0001
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

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.

Regarding the comparison with windows (win.. what?) ;-) this computer came
with freedos installed so no such luck here. :-D

--
José Abílio
--
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On Sunday 12 June 2011 18:26:25 Pasi Kärkkäinen wrote:
> > What is the graphics card?
> >
> >
>
> It's ATI radeon RV635. Do you have the same graphics card?

I think so (but I think that are mixing the references :-) ):

# lspci | grep ATI
01:00.0 VGA compatible controller: ATI Technologies Inc Mobility Radeon HD
3650
01:00.1 Audio device: ATI Technologies Inc RV635 Audio device [Radeon HD 3600
Series]

so I think that the 365 here refers to the digital sound part.

> Thanks for the reply!

Glad to help. :-)

> -- Pasi

--
José Abílio
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