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I am booting to KDE and immediately Xorg uses a constant 40% of one CPU. This occurs on both Ubuntu 20.04 and Debian 11. This severely interferes with mouse usage causing it to lag and stutter mid-drag or highlight

There seem to be a lot of complaints on this issue, but little in the way of solutions other than to start “ripping wires out.” Particularly deafening is the silence from the KDE folks.

I am using the Nvidia 470 drivers (proprietary, tested) but the problem persists.

Here is a screenshot of Xorg CPU usage immediately after booting:

Screenshot.

Does anyone know what is causing it? Or how to fix it?

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  • Did you try to use top .... I don't know exactly how to activate it before KDE...
    – Basile Starynkevitch
    Commented Jan 7, 2022 at 18:41
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    Xorg takes 4% of the machine's cpu, that is 40% of a single CPU as shown above. It is constant from boot in either Ubuntu 20.04 or Debian 11.
    – betacrash
    Commented Jan 8, 2022 at 17:47
  • Does 4% really matters in 2022? Please reply by email to [email protected] (near Paris in France). Good night.
    – Basile Starynkevitch
    Commented Jan 8, 2022 at 21:20
  • Please read the original post. 40% cpu for Xorg under KDE directly affects mouse usability, read: whatever you are dragging is dropped, focus is lost, mouse does not make to where you want when you click, and the click is registered on an unwanted part of the screen. The calendar year makes no difference.
    – betacrash
    Commented Jan 9, 2022 at 23:42
  • Did you try Gnome or XFCE? Do they show the same behavior?
    – Basile Starynkevitch
    Commented Jan 10, 2022 at 18:01

1 Answer 1

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With this last update in Nvidia video drivers, the problem "went away" in both Ubuntu 20.04 and Debian 11.

The update version under which the problem "went away":

Nvidia driver version: 510.47.03

Server vendor string: The X.Org Foundation

Server vendor version: 1.20.13 (12013000)

NV-CONTROL verssion: 1.29

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