O módulo k10temp está carregado? Faz parte do kernel ubuntu padrão.
ubuntu-precise$ modinfo k10temp filename: /lib/modules/3.2.0-24-generic/kernel/drivers/hwmon/k10temp.ko license: GPL author: Clemens Ladisch description: AMD Family 10h+ CPU core temperature monitor srcversion: 7C939FE331D037CED8E383B alias: pci:v00001022d00001603sv*sd*bc*sc*i* alias: pci:v00001022d00001703sv*sd*bc*sc*i* alias: pci:v00001022d00001303sv*sd*bc*sc*i* alias: pci:v00001022d00001203sv*sd*bc*sc*i* depends: intree: Y vermagic: 3.2.0-24-generic SMP mod_unload modversions parm: force:force loading on processors with erratum 319 (bool)