I'm having the same issue with Ubuntu 20.04, linux 5.4.0-31-generic:

user@linux:~$ sudo perf stat -e 
cpu/event=0x28,umask=0x18,name=core_power_lvl1_turbo_license/,cpu/event=0x28,umask=0x20,name=core_power_lvl2_turbo_license/,cpu/event=0x28,umask=0x40,name=core_power_throttle/,cycles
 -a -I 1000 sleep 10
#           time             counts unit events
     1.000170047              1.861      core_power_lvl1_turbo_license          
                         
     1.000170047                284      core_power_lvl2_turbo_license          
                         
     1.000170047            103.012      core_power_throttle                    
                     
     1.000170047         26.525.939      cycles                                 
                     
     2.000358208              2.873      core_power_lvl1_turbo_license          
                         
     2.000358208                411      core_power_lvl2_turbo_license          
                         
     2.000358208            120.125      core_power_throttle                    
                     
     2.000358208         35.270.662      cycles                                 
                     
     3.000529648              2.995      core_power_lvl1_turbo_license          
                         
     3.000529648                325      core_power_lvl2_turbo_license          
                         
     3.000529648            103.505      core_power_throttle                    
                     
     3.000529648         49.564.376      cycles                                 
                     
     4.000701689              2.519      core_power_lvl1_turbo_license          
                         
     4.000701689                354      core_power_lvl2_turbo_license          
                         
     4.000701689            107.696      core_power_throttle                    
                     
     4.000701689         32.302.985      cycles                                 
                     
     5.000874532              2.758      core_power_lvl1_turbo_license          
                         
     5.000874532                366      core_power_lvl2_turbo_license          
                         
     5.000874532            141.070      core_power_throttle                    
                     
     5.000874532         36.180.579      cycles                                 
                     
     6.001046915              2.626      core_power_lvl1_turbo_license          
                         
     6.001046915                370      core_power_lvl2_turbo_license          
                         
     6.001046915            116.084      core_power_throttle                    
                     
     6.001046915         38.366.890      cycles                                 
                     
     7.001218040             26.266      core_power_lvl1_turbo_license          
                         
     7.001218040                418      core_power_lvl2_turbo_license          
                         
     7.001218040            128.776      core_power_throttle                    
                     
     7.001218040      1.201.403.076      cycles                                 
                     
     8.001399922              2.625      core_power_lvl1_turbo_license          
                         
     8.001399922                410      core_power_lvl2_turbo_license          
                         
     8.001399922            106.382      core_power_throttle                    
                     
     8.001399922         33.190.255      cycles                                 
                     
     9.001568738              2.781      core_power_lvl1_turbo_license          
                         
     9.001568738                384      core_power_lvl2_turbo_license          
                         
     9.001568738            138.116      core_power_throttle                    
                     
     9.001568738         35.559.397      cycles                                 
                     
    10.000447616              4.056      core_power_lvl1_turbo_license          
                         
    10.000447616                632      core_power_lvl2_turbo_license          
                         
    10.000447616            201.168      core_power_throttle                    
                     
    10.000447616         41.275.834      cycles  

Are there any updates?

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https://bugs.launchpad.net/bugs/1727136

Title:
  [GLIBC] Fix glibc AVX frequency problems

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