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If, like me, you are experiencing intermittent problems with some linux applications ignoring your mouse wheel while running in a linux guest… check out this thread on the virtual box forums.

On an updated Manjaro Linux Guest on 8/4/2020 I was finally able to fix this with a few different things, I'm not entirely certain which of them are needed or if all of them are. The next time this I encounter this problem, I should try imwheel first, then the 99-mouse-edev.conf file followed by editing the 30-touchpad.conf file. EDIT: on Manjaro, the `imwheel` command below was all that was required.

• Installed the xf86-input-evdev:
• Edited /etc/X11/xorg.conf.d/30-touchpad.conf:

Section "InputClass"
    Identifier "touchpad"
    # Driver "libinput"
    Driver "evdev"
    MatchIsTouchpad "on"
    Option "Tapping" "on"
EndSection

• Added /etc/X11/xorg.conf.d/99-mouse-evdev.conf:

Section "InputClass"
        Identifier "libinput pointer catchall"
        MatchIsPointer "on"
        MatchDevicePath "/dev/input/event*"
        Driver "evdev"
EndSection

• Restarted.
• Installed the imwheel package
• Started imwheel with the following command: imwheel -b 45 (This must be configured as a start-up application.)