On Sun 07 Aug 2011 at 17:56:45 +0200, Hans-J. Ullrich wrote: > But how can I get the cpu stay in low frequency mode whatever happens? I > suppose, a command related to /proc might help. But which command is telling > the cpu to stay in low mode? Any help is welcome. http://wiki.debian.org/HowTo/CpuFrequencyScaling One of the cpufreq_powersave or cpufreq_userspace governors may be what you need.