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Somewhat related to this: Mouse pointer moving by itself - but there is no "keyboard mouse".

Currently my workstation, with a fresh install of Ubuntu 22.04 (and all updates) is experiencing phantom mouse movement. This did not happen on 20.04 two weeks ago. A few days ago, the mouse was connected, it was moving the pointer to the top-left corner, and clicking (bringing up the Cinnamon menu).

Today, with no mouse connected, the cursor is moving in a lazy lissajous within a terminal window, occasionally double-clicking. Desktop is set to "focus follows mouse"; sometimes I see the window loose focus for an absolute split-second, cursor warping about 1000 pixels to the right (to some empty desktop) before returning.

There was a mouse connected through a USB hub (along with the keyboard), but I have pulled the whole lot to switch it between computers. It's been disconnected for some hours.

Is this indicative of a hardware fault? It's really creeping me out. PC hardware is self-assembled: MSI-mothebroard, Intel i9, 64G RAM, maybe 6 months old.

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  • I, uh, might have found an old mouse plugged into the USB hub, but dangling down behind the desk. (ー_ー﹡; )
    – Kingsley
    Commented Nov 29, 2022 at 1:07

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This seems to be an issue with Wayland. I have read some forums on this issue as well. I hope your PC has a stick pointer. First I tried disabling the stick pointer. Mouse pointer moving by itself

If disabling the stick pointer does not work out for you, try changing the custom.conf file in path /etc/gdm3/custom.conf. Uncomment the following line. #WaylandEnable=false. The custom.conf file is read-only. So you may need to use sudo vim custom.conf to edit it. This seemed to do the trick for me.

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    If you want to disable the stick pointer use the following commands. xinput list xinput disable <stick pointer id> Commented Dec 21, 2023 at 8:43

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