Laptop CPU overheating in Fedora, temperature +30 celsius higher than in Windows
jamatos at fc.up.pt
Sun Jun 12 17:20:55 UTC 2011
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).
> - 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
> # cat /sys/bus/acpi/devices/LNXTHERM\:03/path
> "acpi -t" also shows the same CPU temperature.
> Fedora 15 Linux 2.6.38 dmesg here:
> Any ideas how to track what's causing that? All suggestions welcome!
> -- Pasi
What is the graphics card?
I am running this from a laptop of the same model and I see:
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)
Adapter: PCI adapter
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
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
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