I recently switched from Windows to Ubuntu 18.10 with this Notebook, and despite is not a serious problem I noticed that often the fan turn on for ~3 sec. then turn off for ~5 sec. and then turn on again following this pattern.
I've taken a look to system monitor and I noticed that every time it happens, is because one of the cores of the CPU has gone to 100% of usage for few seconds (while the others are almost idle), like it shows the pic below:
I don't get why sometimes one core goes to 100% (for example it happens when I'm just running Firefox with few tabs on the process Web Content) and if I can do sometimes to avoid it (at least to the fan, beacuse the continuosly turn on/off it's a bit annoying).
It's a little bit difficult to reproduce the problem when I try. Anyway, testing again showed me that sometimes fans activate in the same way also when no CPU reaches 100% of utilization (just lower peaks). Running
ps aux --sort=-pcpu | head as @Fabby in the comment said, gave me the following :
ollaw 2053 15.1 0.7 443272 126220 tty2 Sl+ nov28 17:00 /usr/lib/xorg/Xorg vt2 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -background none -noreset -keeptty -verbose 3
ollaw 7543 12.0 2.4 2532128 402472 tty2 Sl+ 01:03 1:22 /usr/lib/firefox/firefox -new-window
ollaw 7612 10.8 2.5 1978608 413444 tty2 Sl+ 01:03 1:13 /usr/lib/firefox/firefox -contentproc -childID 1 -isForBrowser [etc....]
- Almost the same as 3
ollaw 2234 5.3 1.4 3300616 244520 tty2 Rl+ nov28 5:58 /usr/bin/gnome-shell
- No error in
dmesgsince someone in the answer asked.
- Currently using
- Nvidia is in
intel-mode(but pretty sure it happens also in