Phantom mouse wheel events without user input

[keiserr]

This doesn't occur with Firefox. But it occurs with Chrome AND gnome-terminal.

What happens is that if I have more than one tab in focus, it moves to the last tabs by itself.

Here is a screen capture of what happens.

I am running ubuntu 18.04.5 LTS, i have never had this issue before. Issue started happening since yesterday.

This morning I applied my updates hoping that this will fix it, but even then nothing happened.

I have known this to happen in another older laptop running an older version of ubuntu as well.

journalctl -f gives me ths following:

```
Nov 23 15:28:36 xxxmymachinenamexxx gnome-shell[4051]: pushModal: invocation of begin_modal failed

```

Note that this error entry from the journalctl does not always appear when the tabs cycle through like in the video, might be unrelated.

My graphics card is:

lspci |grep VGA

```
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)

```

I thought initially it might be some key that is being pressed, so i ran screenkey when this happens, there was no key appearing, so it does not seem that this is a key being pressed.

I tail -f /var/log/syslog and /var/log/Xorg.0.log when i click on the tabs and it does this weirdness, nothing happens. So i don't have much information to give on this issue. Please get in touch with me if you want any information. I cannot push all my logs since it is a professional laptop.

[keiserr (keiserr)]

Even after multiple restart the issue was not fixed. Turns out it was affecting every application that involved mouse wheel down. when I pressed ctrl, it would zoom out etc.

User level FIX: Weirdly, after I plugged in a USB mouse, and plugged it out. The issue stopped. Yep, just like that.

[keiserr (keiserr)]

Note, even disabling the touchpad, or unloading the kernel touchpad drivers didn't solve it. I had to plug in a mouse and remove it to stop having this problem

[Daniel van Vugt (vanvugt)]

It sounds like you have a peripheral that's generating unwanted mouse wheel events. If the problem is still happening then please run 'xev' in a Terminal window and move the mouse pointer over the little white window. Now do you see new events being logged in the Terminal window?

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1905287

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Launchpad Janitor (janitor)]

[Expired for mutter (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]

[Launchpad Janitor (janitor)]

[Expired for libinput (Ubuntu) because there has been no activity for 60 days.]