Comment 18 for bug 1389077

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René Jochum (pcdummy) wrote : Re: [HP ProBook 4530s] Intel Powerclamp is Slowing CPU

Had the same trouble, blacklisting intel_powerclamp and intel_rapl fixed it. Thanks to @krzysdrewniak.

sudo sh -c 'cat <<EOF > /etc/modprobe.d/blacklist-power.conf
# See: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1389077
blacklist intel_powerclamp
blacklist intel_rapl
EOF'

Thanks.