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I had asked this question before for Ubuntu 18.04, then upgrade to 20.04. But issue still same.

My Processor spec :

AMD Ryzen 7 PRO 2700U APU Integrated Radeon Vega Graphics

Kernel : 5.4.25-050425-generic

Powertop and TLP enabled.

Power top stat

Power est.              Usage       Events/s    Category       Description
  560 mW    641.2 µs/s     141.6        kWork          dbs_work_handler
  294 mW      4.0 ms/s      72.7        Interrupt      [67] amdgpu
  238 mW    603.6 µs/s      60.1        Timer          tick_sched_timer
  207 mW      4.6 ms/s      45.6        Process        [PID 2708] /usr/bin/gnom
  195 mW      6.7 ms/s      42.7        Process        [PID 2529] /usr/lib/xorg
 91.1 mW      3.7 ms/s      20.4        Process        [PID 13188] /usr/libexec
 61.8 mW    340.3 µs/s      15.5        Process        [PID 1390] /usr/bin/cont
 46.4 mW    284.9 µs/s      11.6        Process        [PID 667] [sdma0]
 42.3 mW    120.8 µs/s      10.7        kWork          psi_avgs_work
 38.6 mW    184.6 µs/s       9.7        Process        [PID 11] [rcu_sched]
 31.3 mW    447.7 µs/s       7.8        Process        [PID 12314] /usr/lib/fir
 31.2 mW    364.0 µs/s       7.8        Process        [PID 5526] /usr/bin/cont

TLP config :

TLP_ENABLE=1

CPU_SCALING_GOVERNOR_ON_BAT=powersave

CPU_SCALING_MAX_FREQ_ON_AC=0
CPU_SCALING_MIN_FREQ_ON_BAT=0

SCHED_POWERSAVE_ON_BAT=1

RADEON_POWER_PROFILE_ON_BAT=auto

RADEON_DPM_STATE_ON_BAT=battery

RESTORE_THRESHOLDS_ON_BAT="1"

Here, its more related to radio drivers. And here its not being answered.

When laptop is powered on and nothing is running, I could here fan is working (after few minutes booted)

CPU temperature graph

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