Xfce, applet indicator-cpufreq, not working when set to Powersafe from Performance

Os

Linux local 5.0.0-23-lowlatency #24-Ubuntu SMP PREEMPT Mon Jul 29 16:17:02 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux xfce4-panel 4.13.4 (Xfce 4.12) 

Issue

I am using indicator-cpufreq applet. Everything is ok, switching from Powersafe to Performance and back is ok, but sometimes switch from Performance to Powersafe don’t work, when I am using Performance for a long time. I checked it via lscpu.

CPU MHz:             3500.181 CPU max MHz:         3500,0000 CPU min MHz:         400,0000 

Only restart helped.

Where is the catch? How can I switch to Powersafe mode from terminal?

Thanks.