Limitação limitada da política de cpower

Question

Como altero o intervalo de políticas do cpufreq?

$ cpupower frequency-info
analyzing CPU 0:
  driver: powernow-k8
  CPUs which run at the same hardware frequency: 0 1
  CPUs which need to have their frequency coordinated by software: 0 1
  maximum transition latency: 109 us
  hardware limits: 800 MHz - 2.00 GHz
  available frequency steps:  2.00 GHz, 1.80 GHz, 1.60 GHz, 800 MHz
  available cpufreq governors: conservative ondemand userspace powersave performance schedutil
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.
  current CPU frequency: Unable to call hardware
  current CPU frequency: 800 MHz (asserted by call to kernel)
  boost state support:
    Supported: no
    Active: no

Você pode ver que o limite de hardware está em 2GHz, mas o limite de política é de 800. Tentando

$ sudo cpupower frequency-set --max 2000000 
Setting cpu: 0
Setting cpu: 1

mas sem efeito:

$ cpupower frequency-info --policy
analyzing CPU 0:
  current policy: frequency should be within 800 MHz and 800 MHz.
                  The governor "ondemand" may decide which speed to use
                  within this range.

Eu tentei repetir os valores diretamente:

echo 2000000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq

sem dados.

O problema acontece no xubuntu 17.04 x86_64 e no mais recente Majnaro i686, então eu não acredito que seja específico da distribuição.