Comment # 2 on bug 978953 from Takashi Iwai

It looks like that sp5100_tco watchdog driver is broken for your systems.
Try to blacklist the module: e.g. add the following line to
/etc/modprobe.d/99-local.conf.
  blacklist sp5100_tco

There is a patch posted to linux-watchdog ML which might help:
  http://www.spinics.net/lists/linux-watchdog/msg09165.html