Ubuntu
linux package

  1. Bug #748574
  2. Comment #37

Comment 37 for bug 748574

Revision history for this message
HaraldK (hkubota-gmx) wrote :

Probably not really needed, but I can confirm this the same problem (upgrade from Kubuntu 10.10 to 11.04, /proc/acpi/thermal_zone is missing, fan spins at high speed, and CPU still gets throttled (/sys/devices/system/cpu0/thermal_throttle/core_throttle_count shows not 0) due to overheating).
The fans slows down when I slow down the CPUs by doing a simple

echo 931000 > /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq

for all CPUs (I got 8).

That means:
Fan control works somehow.
/proc/acpi/thermal_zone makes it difficult to check the temperature.
Seems CPUs are kept busy too much somehow since the upgrade.

Hardware: Dell Vostro 3700 (Intel i7, quad core, nVidia video).

For all those who don't like noisy notebooks, my workaround (attached)