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Pasi Kärkkäinen 06-12-2011 03:56 PM

Laptop CPU overheating in Fedora, temperature +30 celsius higher than in Windows
 
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

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Peter Lemenkov 06-12-2011 05:36 PM

Laptop CPU overheating in Fedora, temperature +30 celsius higher than in Windows
 
2011/6/12 Pasi Kärkkäinen <pasik@iki.fi>:
> 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).

Same model, no tweaks at all:

[helena@moderato ~]$ sensors
acpitz-virtual-0
Adapter: Virtual device
temp1: +30.0°C (crit = +115.0°C)
temp2: +69.0°C (crit = +105.0°C)
temp3: +34.3°C (crit = +112.0°C)
temp4: +65.0°C (crit = +112.0°C)
temp5: +49.0°C (crit = +90.0°C)
temp6: +16.0°C (crit = +112.0°C)

nouveau-pci-0100
Adapter: PCI adapter
temp1: +71.0°C (high = +100.0°C, crit = +110.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Core 0: +57.0°C (high = +105.0°C, crit = +105.0°C)

coretemp-isa-0001
Adapter: ISA adapter
Core 1: +58.0°C (high = +105.0°C, crit = +105.0°C)

[helena@moderato ~]$

--
With best regards, Peter Lemenkov.
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Andreas Tunek 06-12-2011 06:54 PM

Laptop CPU overheating in Fedora, temperature +30 celsius higher than in Windows
 
2011/6/12 José Matos <jamatos@fc.up.pt>:
> 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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>

You are probably hitting https://bugzilla.redhat.com/show_bug.cgi?id=702953
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