https://bugs.kde.org/show_bug.cgi?id=411234

            Bug ID: 411234
           Summary: MadCatz RAT4 not working after SDDM/Plasma start
           Product: plasmashell
           Version: 5.16.4
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: k...@davidedmundson.co.uk
          Reporter: k...@stephan-brunner.net
                CC: plasma-b...@kde.org
  Target Milestone: 1.0

Created attachment 122313
  --> https://bugs.kde.org/attachment.cgi?id=122313&action=edit
Xorg-Log

SUMMARY
After starting SDDM or Plasma-Shell, my mouse (Mad Catz RAT 4 USB, Model No
43731) does not work correctly.
For instance, I can not left-click or right-click on anything. 
After doing a vty-switch using CTRL+ALT+F2, waiting for some time, then switch
back to VTY1, I can now right-click.
However, left-click now only works on apps other than plasma-shell.

However, Plasma can't rendered correctly now: Notifications, the startmenu,
etc. are now transparent.
To get this working again I have to `kquitapp5 plasmashell && sleep 2 &&
kstart5 plasmashell` to get it working.
(This happens however on every VTYSwitch, another bug report filed here
aswell.)

This happened from the first day on using a fresh ArchLinux install with
`pacman -S plasma-desktop sddm`.
Replugging the mouse seems to help aswell.
Other mice are not affected, they work great without any issues.

I am using the latest ArchLinux packages.
This bug is reproducible using the proprietary NVIDIA drivers (430.40, DKMS)
and nouveau-drivers.

STEPS TO REPRODUCE
1. systemctl enable sddm
2. Reboot
3. Try to click on something in the login screen, not working
4. Log in to plasma
5. Mouse still not working
6. Switch to other VTY
7. Wait some time
8. Switch Back to VTY1
9. Right-Click on Desktop is now working, some apps can get left-clicked.
Left-Click on any plasma panel still not working.
10. Start console via keyboard
11. `kquitapp5 plasmashell && sleep 2 && kstart5 plasmashell`
12. Plasma restarts, mouse is now working again

OBSERVED RESULT
Mouse not working correctly after sddm/plasma startup


EXPECTED RESULT
Mouse should be working after sddm/plasma startup


SOFTWARE/OS VERSIONS
Linux: 
  - `uname -a`: Linux XXXXX 5.2.9-arch1-1-ARCH #1 SMP PREEMPT Fri Aug 16
11:29:43 UTC 2019 x86_64 GNU/Linux
KDE Plasma Version: 
  - `plasmashell --version`: plasmashell 5.16.4
KDE Frameworks Version: 6.51.0
Qt Version: 5.13.0

ADDITIONAL INFORMATION
Mainboard: Asus Z170-A, mouse is plugged in on USB Bus 1, Dev 3 (lsusb)

Attached is the Xorg Log.

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