Since I upgraded Ubuntu 16.04 to Ubuntu 18.04.1 LTS on my Dell XPS 9560 I faced many issues like not recognized the NVIDIA GPU and dead touchpad.

Right now the issue is that even with a minimum workload and CPU usage(and Nvidia GPU disabled)

Also, I believe that the output of sensors is not accurate as it reports temperatures of 67.0°C for the CPU right now, but physically the left side of the keyboard is extremely hot.

I tried undervolting the CPU and Intel HD GPU as people suggested in other posts , but still the problem remains. sudo undervolt --gpu -100 --core -115 --cache -115

Adapter: ISA adapter
Package id 0:  +52.0°C  (high = +100.0°C, crit = +100.0°C)
Core 0:        +52.0°C  (high = +100.0°C, crit = +100.0°C)
Core 1:        +52.0°C  (high = +100.0°C, crit = +100.0°C)
Core 2:        +51.0°C  (high = +100.0°C, crit = +100.0°C)
Core 3:        +51.0°C  (high = +100.0°C, crit = +100.0°C)

Adapter: Virtual device
temp1:        +56.5°C  

Adapter: Virtual device
temp1:        +25.0°C  (crit = +107.0°C)

Adapter: Virtual device
Processor Fan: 3194 RPM   <------------------ ***
Video Fan:     3241 RPM   <------------------ ***
CPU:            +67.0°C   <------------------ ***
Ambient:        +54.0°C  
Ambient:        +48.0°C  
Other:          +40.0°C  

Adapter: PCI adapter
temp1:        +49.0°C  (high = +95.0°C, hyst =  +3.0°C)
                   (crit = +105.0°C, hyst =  +5.0°C)
                   (emerg = +135.0°C, hyst =  +5.0°C)

Also, the CPU frequency at time is:

lscpu | grep MHz
CPU MHz:             2880.877
CPU max MHz:         3800.0000
CPU min MHz:         800.0000

And the current system usage: System load

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