What driver control my cpu? Probably isn't a cpufrequtils issues Impossible to scale freq... Thanks $ cpufreq-info cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@xxxxxxxxxxxxxxx, please. analyzing CPU 0: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 1: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 2: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. analyzing CPU 3: no or unknown cpufreq driver is active on this CPU maximum transition latency: 4294.55 ms. $ lsb_release -a No LSB modules are available. Distributor ID: Debian Description: Debian GNU/Linux unstable (sid) Release: unstable Codename: sid $ lsmod | grep cpu cpufreq_userspace 16384 0 cpufreq_conservative 16384 0 cpufreq_stats 16384 0 cpufreq_powersave 16384 0 acpi_cpufreq 20480 0 processor 36864 1 acpi_cpufreq $ uname -a Linux Bigdebian 4.2.0-1-amd64 #1 SMP Debian 4.2.6-1 (2015-11-10) x86_64 GNU/Linux $ cat /proc/cpuinfo | grep "model name" model name : Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz model name : Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz model name : Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz model name : Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz -- Lorenzo S. -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html