whiteghost

tmpfs                       /tmp                     tmpfs noatime         0 0
tmpfs                       /var/tmp/portage  tmpfs  size=8G,uid=portage,gid=portage,mode=775,noatime 0 0
tmpfs                       /dev/shm              tmpfs  nodev,nosuid,noexec,noatime                  0 0

sandro, i think you are missing the point on pstate driver.
 
when i use i7z, it may show frequency maxed out at 3.9GHz, but c1 state shows 97 percent of processor is in halt state.
 
isn't that power saving?
 
for a long time i had microcode enabled in kernel and would see in dmesg something about microcode driver. 
 
i assumed it was working but there is more too it.
 
i use git-sources. i use method two from this page
https://fitzcarraldoblog.wordpress.com/2014/11/06/updating-intel-cpu-microcode-from-gentoo-linux/

i added cpupower to default runlevel with this line in conf.d
 START_OPTS="--governor powersave -d 1000MHz -u 2000MHz"
and it works.

Every 5.0s: cat /proc/cpuinfo | grep "MHz"                                                                      Fri Jul 15 18:43:12 2016
 
cpu MHz         : 3899.902
cpu MHz         : 3900.329
cpu MHz         : 3899.902
cpu MHz         : 3900.115
 
 
look at documentation - /usr/src/linux/Documentation/cpu-freq/
 
i disable acpi driver enable pstate and powersave gov and pstate works automatically.  googling pstate - it gets too technical for me.
i use cpupower frequency info and cpupower frequency set

# CPU Frequency scaling
#
CONFIG_CPU_FREQ=y
# CONFIG_CPU_FREQ_STAT is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set
CONFIG_CPU_FREQ_DEFAULT_GOV_POWERSAVE=y
# CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE is not set
# CONFIG_CPU_FREQ_DEFAULT_GOV_SCHEDUTIL is not set
CONFIG_CPU_FREQ_GOV_PERFORMANCE=m
CONFIG_CPU_FREQ_GOV_POWERSAVE=y
# CONFIG_CPU_FREQ_GOV_USERSPACE is not set
# CONFIG_CPU_FREQ_GOV_ONDEMAND is not set
# CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set
# CONFIG_CPU_FREQ_GOV_SCHEDUTIL is not set
 
#
# CPU frequency scaling drivers
#
CONFIG_X86_INTEL_PSTATE=y
# CONFIG_X86_PCC_CPUFREQ is not set
# CONFIG_X86_ACPI_CPUFREQ is not set
# CONFIG_X86_SPEEDSTEP_CENTRINO is not set
# CONFIG_X86_P4_CLOCKMOD is not set
 
#
# shared options
#
# CONFIG_X86_SPEEDSTEP_LIB is not set
 
#
# CPU Idle
#
CONFIG_CPU_IDLE=y
# CONFIG_CPU_IDLE_GOV_LADDER is not set
CONFIG_CPU_IDLE_GOV_MENU=y
# CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED is not set
CONFIG_INTEL_IDLE=y
 
 
 
 # cpupower frequency-info
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:  Cannot determine or is not supported.
  hardware limits: 800 MHz - 3.90 GHz
  available cpufreq governors: performance powersave
  current policy: frequency should be within 800 MHz and 3.90 GHz.
                  The governor "powersave" may decide which speed to use
                  within this range.
  current CPU frequency: 895 MHz (asserted by call to hardware)
  boost state support:
    Supported: yes
    Active: yes
 
 
i do not have cpupower added to rc

http://swift.siphos.be/linux_sea/kernelbuilding.html
 
http://swift.siphos.be/linux_sea/kernelbuilding.html#idm3571767349040

$ cat /usr/share/i18n/SUPPORTED | grep BR pt_BR.UTF-8 UTF-8 pt_BR ISO-8859-1    
put 
 
pt_BR.UTF-8 UTF-8
  in /etc/locale.gen
 
then run 
 
#locale-gen
 
nano  ~/.bashrc
export LANG="pt_BR.UTF-8"
export LC_COLLATE="C"   For a system-wide default locale:
root #env-update && source /etc/profile For a user-specific locale:
 
user $source ~/.bashrc         xfce ~ # locale LANG=pt_BR.UTF-8 LC_CTYPE="pt_BR.UTF-8" LC_NUMERIC="pt_BR.UTF-8" LC_TIME="pt_BR.UTF-8" LC_COLLATE=C LC_MONETARY="pt_BR.UTF-8" LC_MESSAGES="pt_BR.UTF-8" LC_PAPER="pt_BR.UTF-8" LC_NAME="pt_BR.UTF-8" LC_ADDRESS="pt_BR.UTF-8" LC_TELEPHONE="pt_BR.UTF-8" LC_MEASUREMENT="pt_BR.UTF-8" LC_IDENTIFICATION="pt_BR.UTF-8" LC_ALL=     # nano /etc/portage/make.conf   LINGUAS="pt_BR"