go to Yast, system, powermanagement & set it up. It's all a function of how hard you are driving your CPU Use acoustic, throtling, etc = mess around
look at each with: cd to /proc/whatever then cat /proc/whatever.
to change them:
learn the echo command in the same chapter: echo /proc/whatever=something as root.
or in Yast:
System, /etc/sysconfig editor, but first read the book.