For days, I can't figure out what is going on with my PC/Ubuntu 18.04.


CPU: i7-8700

GPU: GTX 1060 6GB

OS is installed on Kingston A1000, M.2 - 480GB

RAM: HyperX Predator 16GB (2x8GB) DDR4 3000 so I think HW should be more than OK.

The Ubuntu freezes for short amounts of time (like 0.2 sec), I can see it when I'm writing something (it freezes for moment) or when I scroll in browser (sound starts crackling) or even sometimes when I copy text to clipboard.

I noticed that even scrolling on website increases CPU usage to almost 80% but not sure if it's the problem.

Or - when I started libre office, sound was crackling for some time (0.5 sec).

I have 3 FullHD monitors connected to my GPU - 2 monitors and 1 TV but I it happens even without TV connected - 2 monitors.

Some metrics:

before scrolling

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during scrolling

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SSD I have 335 GB free from 480 GB.

RAM is not a problem probably:

enter image description here

Throttling because of temperature is unlikely:

milano@milano-PC:~$ sensors
Adapter: Virtual device
temp1:        +42.0°C  

Adapter: ISA adapter
Package id 0:  +40.0°C  (high = +82.0°C, crit = +100.0°C)
Core 0:        +39.0°C  (high = +82.0°C, crit = +100.0°C)
Core 1:        +40.0°C  (high = +82.0°C, crit = +100.0°C)
Core 2:        +39.0°C  (high = +82.0°C, crit = +100.0°C)
Core 3:        +39.0°C  (high = +82.0°C, crit = +100.0°C)
Core 4:        +37.0°C  (high = +82.0°C, crit = +100.0°C)
Core 5:        +38.0°C  (high = +82.0°C, crit = +100.0°C)

lscpu returns very different values over time but it is capable to reach higher frequencies so it is not problem too:

Stepping:            10
CPU MHz:             3167.816
CPU max MHz:         4600,0000
CPU min MHz:         800,0000
BogoMIPS:            6384.00

I've installed GPU drivers from PPA and set 415, but I don't think it helped: enter image description here

Even animations are turned off: strong text

Almost all GNOME extensions are off:

enter image description here

I run out of ideas, do you have some?

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