Just noticed this (2.6.24-rc5-g4af75653):

	$ echo 0 > /proc/sys/kernel/nmi_watchdog

	$ cat /proc/sys/kernel/nmi_watchdog
	1

	$ dmesg
	[...]
	[ 8369.224500] NMI watchdog doesn't know what hardware to touch

full dmesg && config attached

-- 
	Paolo Ornati
	Linux 2.6.24-rc5-g4af75653 on x86_64