[EN] Very high cpu load with lightdm/X

[eQuacky]

Hi all

I have an older asus eee pc which I am using just for printing sporadically. Updates are done frequently by console.

After end of freeze I can remember for upgrades of lightdm, lightdm greeter etc. but never tried out the installed lxqt up to couple of days ago where I had to notice that the graphical UI run almost with 100 % on both processor cores and it needed at least minutes to execute any orders.

Maybe someone could give a hint where the annoying issue resides.

Thanks in advance.

Thomas

[melmarker]

One could leave X (best with systemctl stop lightdm) and delete the user configurations for lxqt.

rm -r .config/lxqt - after that start lightdm again and login. LXQt should behave fine now - it may be that some 'old' settings causes that behaviour, didn't find the the exact entry yet - but LXQt it a very fast moving target and such breakages can and will happend until the switch to kf5 components and Q 5.4.2 (5.5 later) is completed.

[eQuacky]

@melmarker

thanks for reply, but didn't help.

Deleted both .config/lxqt in /home and /etc/skel/ after having stopped lightdm. After restarting still same behavior with that high cpu load.

Any further tips?

[dibl]

Does htop show what process(es) is/are running up the CPU?


FYI, I did have an Asus EEE PC 701 some years ago, and it has its limitations, with a 630Mhz CPU.  A browser with multiple tabs would push it hard, for example.

[melmarker]

https://github.com/lxde/lxqt/issues/686 - eventually more detailed informations (which process runs @100% may be helpful)

[eQuacky]

@dibl
It's probably a better machine (eee 1005ha) than you had. It also went like clockwork before upgrading after releasing of debian freeze. Only starting of bigger apps needed a little bit longer to come up. But once started no probs. Multiple tabs in qupzilla or iceweasel were never a problem.


@melmarker
PID 1027 in following light.txt is the evildoer which runs up to 100 %.

[eQuacky]

had a deeper look on my first laptop - Thinkpad X121e.


Same behavior with lxqt and slightly less load with cinnamon. KDE and Xfce didn't show that effect. Both are running fine. All flavors are using lightdm.