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Slow CPU after resume / Ubuntu 16.04 LTS too slow after suspend and resume

you might experience a slow performance in ubuntu 16.04 after resuming back from a sleep or hibernate. reason for this is it doesn't move away from powersave mode automatically. intel_pstate driver is the one making this problem, so we have to disable it and use acpi-cpufreq  driver.

first lets check weather your competer is on powersave. 






cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor




If your answer is powersave we have to move it to performance state.

get your cpu info by
cat /proc/cpuinfo | grep MHz

 probabaly you seeing 4 cores

lets update scaling governers

    echo 'performance' > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
    echo 'performance' > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
    echo 'performance' > /sys/devices/system/cpu/cpu2/cpufreq/scaling_governor
    echo 'performance' > /sys/devices/system/cpu/cpu3/cpufreq/scaling_governor

now your computer running as usual in perfonace mode.

this change will reset after a reboot. to make the change perment

 vi /etc/default/grub
 and change

GRUB_CMDLINE_LINUX_DEFAULT="ipv6.disable=1 intel_pstate=disable"




 finally run
sudo update-grub


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