this report is from running lm-sensor when system is idle:

kernel 4.18.0.8

amdgpu-pci-6500
Adapter: PCI adapter
vddgfx:       +0.77 V  
fan1:         974 RPM
temp1:        +30.0°C  (crit = +94.0°C, hyst = -273.1°C)
power1:        6.11 W  (cap =  48.00 W)

kernel 4.18.0.9.10

amdgpu-pci-6500
Adapter: PCI adapter
vddgfx:       +1.08 V  
fan1:         974 RPM
temp1:        +41.0°C  (crit = +94.0°C, hyst = -273.1°C)
power1:        18.47 W  (cap =  48.00 W)

clearly the voltage increase is the reason or the dynamic power management is 
broken...
tried with amdgpu.dpm=1 on boot with no luck....

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https://bugs.launchpad.net/bugs/1796720

Title:
  High GPU temperature after kernel 4.18.0.9.10 on AMD RX460

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