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 -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
