Public bug reported:

Release: Kubuntu 17.10.1
kwin: 5.12.4
sddm: 0.14.0
kernel: Linux 4.13.0-38-generic x86_64

If I scroll quickly or extensively, my session crashes to a black screen
resetting to the login dialog for SDDM. I am unsure if this is KWin,
Plasma, or SDDM, but I have tested the following scenarios:

* I noticed before a crash that I repeatedly see this in Xorg.0.log on repeated 
scrolling within a window, regardless of it being a Logitech speed scroll or 
touchpad scrolling:
    [Xi] Too many valuators reported for device 'Virtual core pointer'. 
Ignoring event.
    Previous to any crash, 2 of these appear: [dix] EventToCore: Not 
implemented yet
* Wayland and Xorg show the same behavior when I scroll--crashing after I 
scroll.
* This occurs whether I scroll in Firefox 58.0.1, Kate, Dolphin noting the lack 
of specific graphical toolkits relating to this issue.
* If Plasma was the culprit I am supposing it would just restart plasma-desktop 
rather that lead me back to the login dialog.
* Intel HD 530 graphics (Nvidia modules blacklisted for bbswitch to load on 
demand), with SNA acceleration.  UXA acceleration also showed the same behavior 
after restarting with change to /etc/X11/xorg.conf.d/21-intel.conf

Hoping to fix session crashing on Plasma/SDDM/KWin when scrolling.

** Affects: sddm (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1761270

Title:
  SDDM Crash on Scroll

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