issues on driver CPU

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 [email protected], 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.

You need to read that from:

/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver