Single CPU always at 100%, lagging | Ubuntu 18.04.4
7,125
You could try one or few of:
- Use
htopto see what processes load your system and kill them to see what will happen:killall processnameorkillall -9 processnameto kill it forcefully. - Reinstall a package of a program or command that loads it intensively by:
sudo apt purge package_name && sudo apt autoremove && sudo apt install package_name - Update/Install CPU mocrocode firmware:
sudo apt update && sudo apt install intel-microcode microcode.ctl - Install a different kernel and try it
- Install a different desktop manager:
gdm3instead oflightdmor vice versa, purging previous:sudo apt install gdm3 && sudo apt purge lightdm - Install a different desktop environment:
sudo apt install lubuntu-desktopand try it. - Purge
xubuntu-desktoporxfce4as I was noticing that system lags when it is installed, however, not used:sudo apt purge xubuntu-desktop && sudo apt purge xfce*
My pstree -l on 19.10 with gdm3:
├─gdm3─┬─gdm-session-wor─┬─gdm-x-session─┬─Xorg───{Xorg}
│ │ │ ├─gnome-session-b───3*[{gnome-session-b}]
│ │ │ └─2*[{gdm-x-session}]
│ │ └─2*[{gdm-session-wor}]
│ ├─gdm-session-wor─┬─gdm-x-session─┬─Xorg───{Xorg}
│ │ │ ├─gnome-session-b─┬─ssh-agent
│ │ │ │ └─2*[{gnome-session-b}]
│ │ │ └─2*[{gdm-x-session}]
│ │ └─2*[{gdm-session-wor}]
│ └─2*[{gdm3}]
My pstree -l on 18.04 VM:
├─lightdm─┬─Xorg───5*[{Xorg}]
│ ├─lightdm─┬─lxsession─┬─lxpanel─┬─lxterminal─┬─bash───pstree
│ │ │ │ │ ├─bash
│ │ │ │ │ └─2*[{lxterminal}]
│ │ │ │ └─4*[{lxpanel}]
│ │ │ ├─lxpolkit───2*[{lxpolkit}]
│ │ │ ├─openbox───2*[{openbox}]
│ │ │ ├─pcmanfm───2*[{pcmanfm}]
│ │ │ ├─ssh-agent
│ │ │ └─2*[{lxsession}]
│ │ └─2*[{lightdm}]
│ └─2*[{lightdm}]
Run also journalctl -f in a terminal to see what happens. Maybe some gnome-settings-daemon (gsd) constantly trying to do something and fails throwing errors and it takes the whole core.
Switch to lightdm to see if something will be changed, but do it on some tty: Alt+Ctrl+F3: sudo apt purge gdm3 && sudo apt install lightdm. You could also do it without gdm3 removing: sudo dpkg-reconfigure lightdm if you have it installed.
sudo dpkg-reconfigure lightdm
reboot
sudo dpkg-reconfigure gdm3
Maybe switching to lightdm fourth and to gdm3 back somehow changes gdm3 configuration modified previously by different graphical configuration tools.
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Author by
Laaag
Updated on September 18, 2022Comments
-
Laaag over 1 year
I bought a new Laptop which was running fine for about one or two weeks. I can't exactly recall a certain trigger but I now have the problem that one CPU core is almost always running near 100% and the computer is lagging.
I use a dual boot from the beginning on, Windows 10 however is running fine.
Specs:
Ubuntu 18.04.4 LTS
Intel(R) Core(TM) i7-8565U
GeForce GTX 1050 Ti Mobile
16GB RAM
I looked at some other posts but the suggested fixes didn't work for me so far. I made sure the computer uses the NVidia Graphics Card and to my best knowledge newest drivers are installed. I also tried switching to Kubuntu Desktop but the problem remained.
My main problem is, that I can't find the process which is causing the permanent CPU usage. I restarted the computer and let it sit idle for a few minutes, occasionally the CPU usage went down but usually it stays high. (See 2 attached picture)
When I run any other program as well the lagging gets worse, playing a youtube video makes the mouse itself lag heavily and the CPU is almost running at 100% constantly (See picture)
I am thankful for any help and will gladly provide any data / output from commands that are needed, since I want to fix this issue.
Thank you very much
EDIT: The output of
ps aux --sort=-pcpu | headis
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 1602 15.0 0.7 576228 129056 tty2 Sl+ 10:24 6:20 /usr/lib/xorg/Xorg vt2 -displayfd 3 -auth /run/user/1000/gdm/Xauthority -background none -noreset -keeptty -verbose 3 lars 5880 13.5 2.2 3817104 365864 tty2 Sl+ 10:46 2:47 /usr/lib/firefox/firefox -new-window lars 1780 12.4 2.9 4400160 486128 tty2 Rl+ 10:24 5:13 /usr/bin/gnome-shell lars 6139 10.0 1.2 2760008 209576 tty2 Sl+ 10:47 2:00 /usr/lib/firefox/firefox -contentproc -childID 4 -isForBrowser -prefsLen 7500 -prefMapSize 217531 -parentBuildID 20200403170909 -appdir /usr/lib/firefox/browser 5880 true tab lars 2159 5.4 0.2 656356 47904 tty2 Sl+ 10:24 2:16 gnome-system-monitor lars 6776 4.7 1.0 2663220 170720 tty2 Sl+ 11:02 0:13 /usr/lib/firefox/firefox -contentproc -childID 13 -isForBrowser -prefsLen 7823 -prefMapSize 217531 -parentBuildID 20200403170909 -appdir /usr/lib/firefox/browser 5880 true tab root 1386 2.2 0.0 0 0 ? S 10:24 0:56 [irq/152-nvidia] lars 6730 1.2 1.2 2710580 202384 tty2 Sl+ 11:01 0:04 /usr/lib/firefox/firefox -contentproc -childID 12 -isForBrowser -prefsLen 7752 -prefMapSize 217531 -parentBuildID 20200403170909 -appdir /usr/lib/firefox/browser 5880 true tab lars 6003 1.0 1.1 34232032 191064 tty2 Sl+ 10:46 0:13 /usr/lib/firefox/firefox -contentproc -childID 2 -isForBrowser -prefsLen 6684 -prefMapSize 217531 -parentBuildID 20200403170909 -appdir /usr/lib/firefox/browser 5880 true tabI tried unplugging all USB devices but it didn't change anything
EDIT2:
Pictures of htop after fresh install:
EDIT3: Output of
pstree -lsystemd─┬─ModemManager───2*[{ModemManager}] ├─NetworkManager─┬─dhclient │ └─2*[{NetworkManager}] ├─accounts-daemon───2*[{accounts-daemon}] ├─acpid ├─anacron ├─avahi-daemon───avahi-daemon ├─bluetoothd ├─boltd───2*[{boltd}] ├─colord───2*[{colord}] ├─cron ├─cups-browsed───2*[{cups-browsed}] ├─cupsd ├─dbus-daemon ├─deja-dup-monito───3*[{deja-dup-monito}] ├─gdm3─┬─gdm-session-wor─┬─gdm-wayland-ses─┬─gnome-session-b─┬─gnome-shell─┬─Xwayland───9*[{Xwayland}] │ │ │ │ │ ├─ibus-daemon─┬─ibus-dconf───3*[{ibus-dconf}] │ │ │ │ │ │ ├─ibus-engine-sim───2*[{ibus-engine-sim}] │ │ │ │ │ │ └─2*[{ibus-daemon}] │ │ │ │ │ └─26*[{gnome-shell}] │ │ │ │ ├─gsd-a11y-settin───3*[{gsd-a11y-settin}] │ │ │ │ ├─gsd-clipboard───3*[{gsd-clipboard}] │ │ │ │ ├─gsd-color───4*[{gsd-color}] │ │ │ │ ├─gsd-datetime───2*[{gsd-datetime}] │ │ │ │ ├─gsd-housekeepin───2*[{gsd-housekeepin}] │ │ │ │ ├─gsd-keyboard───4*[{gsd-keyboard}] │ │ │ │ ├─gsd-media-keys───4*[{gsd-media-keys}] │ │ │ │ ├─gsd-mouse───2*[{gsd-mouse}] │ │ │ │ ├─gsd-power───4*[{gsd-power}] │ │ │ │ ├─gsd-print-notif───2*[{gsd-print-notif}] │ │ │ │ ├─gsd-rfkill───2*[{gsd-rfkill}] │ │ │ │ ├─gsd-screensaver───2*[{gsd-screensaver}] │ │ │ │ ├─gsd-sharing───3*[{gsd-sharing}] │ │ │ │ ├─gsd-smartcard───4*[{gsd-smartcard}] │ │ │ │ ├─gsd-sound───3*[{gsd-sound}] │ │ │ │ ├─gsd-wacom───3*[{gsd-wacom}] │ │ │ │ ├─gsd-xsettings───4*[{gsd-xsettings}] │ │ │ │ └─3*[{gnome-session-b}] │ │ │ └─2*[{gdm-wayland-ses}] │ │ └─2*[{gdm-session-wor}] │ ├─gdm-session-wor─┬─gdm-x-session─┬─Xorg───2*[{Xorg}] │ │ │ ├─lxsession─┬─lxpanel─┬─firefox─┬─RDD Process───3*[{RDD Process}] │ │ │ │ │ │ ├─2*[Web Content───33*[{Web Content}]] │ │ │ │ │ │ ├─Web Content───35*[{Web Content}] │ │ │ │ │ │ ├─4*[Web Content───34*[{Web Content}]] │ │ │ │ │ │ ├─Web Content───47*[{Web Content}] │ │ │ │ │ │ ├─WebExtensions───29*[{WebExtensions}] │ │ │ │ │ │ └─85*[{firefox}] │ │ │ │ │ └─4*[{lxpanel}] │ │ │ │ ├─lxpolkit───2*[{lxpolkit}] │ │ │ │ ├─openbox───2*[{openbox}] │ │ │ │ ├─pcmanfm───2*[{pcmanfm}] │ │ │ │ ├─ssh-agent │ │ │ │ └─2*[{lxsession}] │ │ │ └─2*[{gdm-x-session}] │ │ └─2*[{gdm-session-wor}] │ └─2*[{gdm3}] ├─ibus-x11───3*[{ibus-x11}] ├─irqbalance───{irqbalance} ├─2*[kerneloops] ├─menu-cached───2*[{menu-cached}] ├─networkd-dispat───{networkd-dispat} ├─nm-applet───3*[{nm-applet}] ├─nvidia-persiste ├─packagekitd───2*[{packagekitd}] ├─polkitd───2*[{polkitd}] ├─pulseaudio───2*[{pulseaudio}] ├─rsyslogd───3*[{rsyslogd}] ├─rtkit-daemon───2*[{rtkit-daemon}] ├─snapd───17*[{snapd}] ├─ssh-agent ├─systemd─┬─(sd-pam) │ ├─at-spi-bus-laun─┬─dbus-daemon │ │ └─3*[{at-spi-bus-laun}] │ ├─at-spi2-registr───2*[{at-spi2-registr}] │ ├─dbus-daemon │ ├─ibus-portal───2*[{ibus-portal}] │ ├─pulseaudio───2*[{pulseaudio}] │ └─xdg-permission-───2*[{xdg-permission-}] ├─systemd─┬─(sd-pam) │ ├─at-spi-bus-laun─┬─dbus-daemon │ │ └─3*[{at-spi-bus-laun}] │ ├─at-spi2-registr───2*[{at-spi2-registr}] │ ├─dbus-daemon │ ├─dconf-service───2*[{dconf-service}] │ ├─gnome-screensav───3*[{gnome-screensav}] │ ├─gnome-terminal-─┬─bash───htop │ │ ├─bash───pstree │ │ └─4*[{gnome-terminal-}] │ ├─goa-daemon───3*[{goa-daemon}] │ ├─goa-identity-se───3*[{goa-identity-se}] │ ├─gvfs-afc-volume───3*[{gvfs-afc-volume}] │ ├─gvfs-goa-volume───2*[{gvfs-goa-volume}] │ ├─gvfs-gphoto2-vo───2*[{gvfs-gphoto2-vo}] │ ├─gvfs-mtp-volume───2*[{gvfs-mtp-volume}] │ ├─gvfs-udisks2-vo───2*[{gvfs-udisks2-vo}] │ ├─gvfsd─┬─gvfsd-trash───2*[{gvfsd-trash}] │ │ └─2*[{gvfsd}] │ ├─gvfsd-fuse───5*[{gvfsd-fuse}] │ ├─indicator-appli───2*[{indicator-appli}] │ ├─indicator-sound───3*[{indicator-sound}] │ ├─xdg-desktop-por───4*[{xdg-desktop-por}] │ ├─xdg-desktop-por───2*[{xdg-desktop-por}] │ ├─xdg-document-po───5*[{xdg-document-po}] │ ├─xdg-permission-───2*[{xdg-permission-}] │ ├─xfce4-notifyd───2*[{xfce4-notifyd}] │ └─xfconfd ├─systemd-journal ├─systemd-logind ├─systemd-resolve ├─systemd-timesyn───{systemd-timesyn} ├─systemd-udevd ├─thermald───{thermald} ├─udisksd───4*[{udisksd}] ├─unattended-upgr───{unattended-upgr} ├─update-notifier───3*[{update-notifier}] ├─upowerd───2*[{upowerd}] ├─whoopsie───2*[{whoopsie}] ├─wpa_supplicant └─xfce4-power-man───2*[{xfce4-power-man}]EDIT: usage with ubuntu on wayland
Output of
journalctl -f-- Logs begin at Thu 2020-04-16 14:32:57 CEST. -- Apr 16 18:03:57 yoshua systemd[1]: Starting Hostname Service... Apr 16 18:03:57 yoshua dbus-daemon[885]: [system] Successfully activated service 'org.freedesktop.hostname1' Apr 16 18:03:57 yoshua systemd[1]: Started Hostname Service. Apr 16 18:03:57 yoshua nautilus[2465]: Called "net usershare info" but it failed: Failed to execute child process “net” (No such file or directory) Apr 16 18:04:06 yoshua eog[2493]: Failed to open file '/home/lars/.cache/thumbnails/normal/bd89ad6e4e39e613a580a0a13dc30c75.png': No such file or directory Apr 16 18:04:16 yoshua org.gnome.Shell.desktop[1512]: libinput error: client bug: timer event11 debounce: offset negative (-234ms) Apr 16 18:04:16 yoshua org.gnome.Shell.desktop[1512]: libinput error: client bug: timer event11 debounce: offset negative (-170ms) Apr 16 18:04:16 yoshua org.gnome.Shell.desktop[1512]: libinput error: client bug: timer event11 debounce short: offset negative (-183ms) Apr 16 18:04:20 yoshua org.gnome.Shell.desktop[1512]: libinput error: client bug: timer event11 debounce: offset negative (-1ms) Apr 16 18:04:20 yoshua org.gnome.Shell.desktop[1512]: libinput error: client bug: timer event11 debounce short: offset negative (-15ms) Apr 16 18:05:55 yoshua dbus-daemon[885]: [system] Activating via systemd: service name='org.freedesktop.hostname1' unit='dbus-org.freedesktop.hostname1.service' requested by ':1.121' (uid=1000 pid=2149 comm="/usr/lib/firefox/firefox -new-window " label="unconfined") Apr 16 18:05:55 yoshua systemd[1]: Starting Hostname Service... Apr 16 18:05:55 yoshua dbus-daemon[885]: [system] Successfully activated service 'org.freedesktop.hostname1' Apr 16 18:05:55 yoshua systemd[1]: Started Hostname Service. Apr 16 18:05:55 yoshua gvfsd[1528]: mkdir failed on directory /var/cache/samba: Permission denied Apr 16 18:05:56 yoshua gvfsd[1528]: mkdir failed on directory /var/cache/samba: Permission denied Apr 16 18:05:57 yoshua gvfsd[1528]: mkdir failed on directory /var/cache/samba: Permission denied Apr 16 18:05:58 yoshua gvfsd[1528]: mkdir failed on directory /var/cache/samba: Permission denied Apr 16 18:05:59 yoshua gvfsd[1528]: mkdir failed on directory /var/cache/samba: Permission denied Apr 16 18:05:59 yoshua gvfsd[1528]: mkdir failed on directory /var/cache/samba: Permission denied Apr 16 18:06:00 yoshua gvfsd[1528]: mkdir failed on directory /var/cache/samba: Permission denied Apr 16 18:06:00 yoshua gvfsd[1528]: mkdir failed on directory /var/cache/samba: Permission denied Apr 16 18:06:10 yoshua kernel: [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=22662 end=22663) time 111 us, min 1073, max 1079, scanline start 1072, end 1080 Apr 16 18:06:13 yoshua kernel: [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=22830 end=22831) time 357 us, min 1073, max 1079, scanline start 1072, end 1096 Apr 16 18:06:45 yoshua kernel: [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=24753 end=24754) time 239 us, min 1073, max 1079, scanline start 1066, end 1079 Apr 16 18:06:51 yoshua gnome-shell[1512]: Some code accessed the property 'WindowPreviewMenu' on the module 'windowPreview'. That property was defined with 'let' or 'const' inside the module. This was previously supported, but is not correct according to the ES6 standard. Any symbols to be exported from a module must be defined with 'var'. The property access will work as previously for the time being, but please fix your code anyway.EDIT: It is working fine now. No more peaks from one core, all are continuously working on a small level. The last thing I did was what @Gryu recommended: I switched into tty. Switched to lightdm
sudo dpkg-reconfigure lightdmwhich didn't change anything. I restarted and switched back to gdm3 via the same command.I don't understand how this helped, but I am happy. Thanks you very much!
EDIT: The way I see it, I can avoid the problem if I shutdown using the physical power-off button. I don't know what to think about it, I just leave the info here.
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Laaag about 4 yearsHey, thanks for your answer. I did a fresh install of Ubuntu, however the problem is still there. It seems like it is a combination of gnome shell and/or Xorg which is causing the high usage. Do you see a way how it can still be there after reinstalling? I will try to attach pictures of
htop -
Laaag about 4 yearsoutputs of
htopnow in main post -
Gryu about 4 yearsTry to install or update your CPU microcode:sudo apt update && sudo apt install intel-microcode. Seems strangely. After fresh install have you upgraded packages? Whatuname -rshows? -
Laaag about 4 yearshm,
intel-microcode is already the newest version (3.20191115.1ubuntu0.18.04.2)I restarted but it's still the same -
Laaag about 4 yearsYes, I just upgraded everything.
uname -rreturns5.3.0-46-generic -
Gryu about 4 yearsOk. I would recommend trying different kernels also. It could be a hardware specific kernel bug.
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Laaag about 4 yearsOkay, thank you very much! I will look into this. I know this is an Ubuntu-forum, but do you think I would have similar problems with another distribution?
-
Gryu about 4 yearsI think you could try, but try different kernels and
lubuntu-desktopbefore it, so we could know if gnome has an issue. You could also post in your question output ofpstree -lcommand copying and pasting text from terminal. -
Laaag about 4 yearsI tried different desktops, which took a while. It feels a little less laggy, but CPU usage is at this high level when using
LXDEorlubuntuI pasted the output ofpstree -lin the main post. I didn't try different kernels yet as this might take me a little. -
Gryu about 4 yearsRun also
journalctl -fin terminal to see what happens. Maybe some gnome-settings-daemon (gsd) constantly trying to do something and fails throwing errors and it takes the whole core. -
rob about 4 yearsDid any of this fix your problem? You accepted the answer, but I don't see what exactly worked for you. Facing the same issue nothing so far has worked for me.
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Gryu about 4 years@Robin Changing to lightdm fourth and to gdm3 back
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Laaag about 4 years@Robin I edited my initial post several times. In the end I wasn't able to find the exact root of the problem. I still have the issue occasionally. But I can reliably fix it by shutting off the laptop with the physical power button (!). Try this.
-
Gryu about 4 yearsHave you trying gdm restarting?
sudo systemctl restart gdm3? And, have you tried other desktop environment? -
rob about 4 years@Gryu
sudo systemctl restart gdm3worked like a charm! How, why, can you elaborate on that? When I ran the command whatever ran there got stuck and I manually rebootet with the power button. Then did it again, again got stuck, rebootet. So I was less than optimistic. But, now for 2 days, I haven't had problems. Huge thanks!! -
Gryu about 4 yearsIt's very difficult to say what's the cause of this issue. The command just restarts display manager. It could mean some software sometimes causes it to work unstable. It's not wide spread issue, so maybe some combination of some hardware, drivers and software causes it. In my case I do not have such configuration, so I could not say exactly what causes it.
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rob about 4 yearsHmm now the Problem is back, as bad as ever. Reappeared after a reboot. But I guess that was to be expected. Thank you for the Hotfix anyways!
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izzulmakin almost 3 yearshappens to me in recent latest kernels only if i plugged external monitor to my laptop. i believe it is xorg stuff
