SENSORS_FAM15H_POWER and SENSORS_K10TEMP should be enabled to make thermal sensors (lm_sensors etc.) work out of the box
*** Bug 414559 has been marked as a duplicate of this bug. ***
+ 14 Aug 2014; Patrick Lauer <patrick@gentoo.org> +genkernel-3.4.51.1-r1.ebuild: + Bump with new kernel configs for x86,amd64. Adds fhandle etc. for udev and + some other useful things.
Fixed in 3.4.51.2.