Bug ID: 390187
           Summary: Glitching/session freeze when changing the tearing
           Product: kwin
           Version: 5.12.0
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: wayland-generic
  Target Milestone: ---

Observed on Intel Ivy Bridge.
Save work first!

1. Change the tearing prevention from "Full screen repaints" to "Automatic" or
vice-versa, and Apply.

2. Move some windows around: observe full-screen black flickering, other
windows being partially painted over the active window while typing, and
general artefacts.

3a. Logout, and confirm with Ok at the logout screen: session freezes with the
logout screen stuck on the screen.

3b. Keep triggering the snap animation by snapping a window against a screen
edge but not letting go: observe snap animation displays a garbage texture.
Continue for about 10 seconds: graphics freezes, cpu goes to 100%, and disk
starts swapping.

4. Try to VT switch: nothing happens.

5. Trigger SysRq+I: get a VT, but it is frozen, and a reboot is necessary, even
though kernel is responsive.
   (If you are lucky, you may get the SDDM greeter, and you can login again

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