cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
1801000 1800000 1700000 1600000 1500000 1400000 1300000 1200000 1100000 1000000 900000 800000 799000
sudo cpufreq-set -g userspace -r
sudo cpufreq-set -f 499000 -r
sudo cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq
799000