Recently, I installed Ubuntu 20.04 on my machine with the following specifications:-
Processor: Intel Core i5, 2.30GHz x 4 (four cores)
Graphics Card: AMD Radeon, 4GB
While working on the computer 2 times for long durations (~10 hours), the system froze - only mouse cursor moving, nothing else. Similar situation is described in this answer.
NOTE: Both the times, I had only 1 web browser opened (Opera) with just 2-3 tabs. No other heavy application running.
I have been keeping track of CPU usage using the system monitor app, and I have noticed that the CPU cores show unusually* very high usage.
(*When I had Ubuntu 18 installed, it didn't have this problem.)
What can be the cause of such high CPU usage?
Also, is there a way to throttle CPU usage so it doesn't reach the 100% usage, so as to prevent system freeze?
when the system froze, I tried to login to the shell using through the command ALT + F1, but instead of shell, login "screen" appeared after some seconds, through which I was able to log into my user profile entering my password. I use the default GNOME desktop enviornment; Originally, I clean-installed Ubuntu via minimal installation.