Same issue here, Phenom 9650 X4 2.3GHz in a Gigabyte MA78GM-US2H.
Started after update to Maverick.
Kernel 2.6.35-23-generic #36-Ubuntu SMP.
After the message the system continues booting normally.
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k10temp unreliable CPU thermal sensor; monitoring disabled
https://bugs.launchpad.net/bugs/6537
Updated to kernel 2.6.32-25-generic #43, this solved the problem, see
part of dmesg below:
[ 13.830817] Linux video capture interface: v2.00
[ 13.854146] bttv: driver version 0.9.18 loaded
[ 13.854149] bttv: using 8 buffers with 2080k (520 pages) each for capture
[ 13.854240] bttv: Bt8xx c
Public bug reported:
After update to 2.6.32-24.41 and 2.6.32-24.42 the bttv driver stopped working,
it doesn detect my bt878 tv card anymore.
When I boot a previous kernel eg. 2.6.32-23.37 the tv card works OK.
See dmesg outputs below, first the working one, with 2.6.32-23.37:
14.095898] Linu