невозможно установить частоту масштабирования процессора

У меня Ubuntu 15.04 на clevo w605sj (Eurocom Electra 2), который очень громко звучит при включенном вентиляторе. Иногда это недопустимо, и поэтому я бы предпочел уменьшить нагрузку на процессор и снизить производительность. Проблема в том, что я не могу получить доступ к регулятору пространства пользователя. В настоящее время у меня есть:

$ sudo cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
performance powersave

Итак, я запустил:

$ sudo modprobe cpufreq_conservative cpufreq_ondemand cpufreq_powersave cpufreq_stats cpufreq_userspace freq_table

Эта команда, кажется, выполнена успешно, так как я не получаю сообщений об ошибках. Однако

$ lsmod | grep freq

ничего не возвращает. Я не знаю много о модулях, поэтому я могу сделать очень простую ошибку. Я пытаюсь следовать этому руководству здесь: https://www.pantz.org/software/cpufreq/usingcpufreqonlinux.html . Вот вывод cpufreq-info в случае, если это полезно:

$ cpufreq-info
cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to cpufreq@vger.kernel.org, please.
analyzing CPU 0:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 0
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency: 0.97 ms.
  hardware limits: 800 MHz - 3.20 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 800 MHz and 3.20 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 3.01 GHz (asserted by call to hardware).
analyzing CPU 1:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 1
  CPUs which need to have their frequency coordinated by software: 1
  maximum transition latency: 0.97 ms.
  hardware limits: 800 MHz - 3.20 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 800 MHz and 3.20 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 2.92 GHz (asserted by call to hardware).
analyzing CPU 2:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 2
  CPUs which need to have their frequency coordinated by software: 2
  maximum transition latency: 0.97 ms.
  hardware limits: 800 MHz - 3.20 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 800 MHz and 3.20 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 3.06 GHz (asserted by call to hardware).
analyzing CPU 3:
  driver: intel_pstate
  CPUs which run at the same hardware frequency: 3
  CPUs which need to have their frequency coordinated by software: 3
  maximum transition latency: 0.97 ms.
  hardware limits: 800 MHz - 3.20 GHz
  available cpufreq governors: performance, powersave
  current policy: frequency should be within 800 MHz and 3.20 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency is 3.03 GHz (asserted by call to hardware).