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
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)
So your CPU temp is what it should be..
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
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!
-- Pasi