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