0

After an update of ubuntu at two weeks ago, Xorg started consuming the CPU excessively:

command top output

Tarefas: 312 total,   2 executando, 247 dormindo,   0 parado,   0 zumbi
%Cpu(s): 23,7 us, 48,0 sy,  0,0 ni, 27,4 id,  0,8 wa,  0,0 hi,  0,1 si,  0,0 st
KiB Mem : 16321780 total, 12180560 free,  1869344 used,  2271876 buff/cache
KiB Swap:  7813116 total,  7813116 free,        0 used. 14068084 avail Mem

 PID USUÁRIO  PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
1418 gdm       20   0  292704  63940  33468 S 131,1  0,4   2:31.88 Xorg
 315 root      19  -1  119924  31060  29872 R  96,0  0,2   1:49.05 systemd-journal
1194 syslog    20   0  263036   5276   3600 S  52,3  0,0   1:04.29 rsyslogd 

In 30 minuts, the systemd-journal consumes more than 10Gb of HD. I've been researching but I have not found much. What I have done is open T:

$ sudo systemctl stop systemd-journald
$ sudo killall Xorg

After that again, I type:

$ sudo systemctl restart systemd-journald  

But sometimes it the screen locks and I can not log in anymore, just turn off the notebook directly on the button.

I have already looked at several logs and did not find much useful information. The specifications of my hardware and software are:

  • Notebook Dell Intel® Core™ i7-7500U CPU @ 2.70GHz × 4
  • RAM 16Gb
  • Graphics NVIDIA® GeForce® 940MX de 4GB, GDDR5​
  • Linux Ubuntu 18.04
  • Graphic driver nvidia-driver-396

Over the past two weeks I've been waiting for some update, but it not happen. Thanks for any help.


I don't know if it makes difference, but I install kernel 4.17 using ukuu.

And so, I found the following information on syslog in so many lines:

SynPS/2 Synaptics TouchPad: Read error 9

I did remove xserver-xorg-input-synaptics and Xorg stopped consuming cpu and HD, but now gnome-shell is in 100% now.

  • So, what are the errors reported by systemd-journald ? Please update your question with this info. – Soren A Jul 18 '18 at 14:25
  • This is a Q&A site - we expect questions and answers. It is ok to answer your own question. So please move the solution to anew answer. – guntbert Sep 11 '18 at 18:02
1

OP’s own answer moved here from the question body:

I was using gdm3 as login manager. I switched to LightDM and the gnome stopped consuming 100% of the CPU.

sudo dpkg-reconfigure gdm3
  • This worked for me! Just remember to reboot after reconfiguring to LightDm – relG Jan 26 at 7:10
0

Temporary solution

I do not know why, but it's working as a temporary solution. After logging into the machine, I kill the gnome-shell process on a terminal, started as root by gdm, and start it as a normal user. It stops using too much cpu.

$ sudo killall gnome-shell
$ gnome-shell &

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.