Xorg cursor artifacts all over everywhere: "When I use the evdi module
and library shipped with Ubuntu in 20.04, then DisplayLink works in
Xorg, but it's very glitchy, with cursor artifacts showing up constantly
all over the place on all screens, both DisplayLink and non-
DisplayLink."

I've seen it, it is a know issue and has a workaround: setting "PageFlip" 
"false" in xorg.conf. This link is not exactly about cursor issues but explains 
how to set the PageFlip workaround:
https://support.displaylink.com/knowledgebase/articles/1181623-displaylink-ubuntu-driver-after-recent-x-upgrades

Anyway, that is off-topic too for this issue, so if you want to discuss
that, I again suggest a new report. I don't think I can help with that
though.

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https://bugs.launchpad.net/bugs/1853357

Title:
  display (whole computer?) hangs when I attempt to use DisplayLink with
  Wayland

Status in Mutter:
  New
Status in mutter package in Ubuntu:
  Incomplete
Status in mutter source package in Eoan:
  Confirmed
Status in mutter source package in Focal:
  Incomplete

Bug description:
  [ Impact ]

  I am using the DisplayLink driver for Ubuntu provided at
  https://www.displaylink.com/downloads/ubuntu

  DisplayLink is working under Xorg, but when I try to use it under
  Wayland my whole display hangs and I can't even switch to a different
  VT with Ctrl-Alt-F3 so I think maybe the whole computer is hung? Not
  certain.

  [ Test case ]

  - Install DisplayLink drivers
  - Start GNOME Shell in wayland mode
  - Connect to a display-link dock
  - Expect the shell to work properly and be visible in the external device

  [ Regression potential ]

  Wayland session won't work even for standard drm devices

  
  ----

  I am using the DisplayLink driver for Ubuntu provided at
  https://www.displaylink.com/downloads/ubuntu, which I think is the
  only way to get DisplayLink fully working under Ubuntu? That is,
  DisplayLink didn't work when I installed the evdi-dkms and libevdi0
  Ubuntu packages, and I couldn't find any other packages that might be
  relevant (did I miss something?) so as far as I can tell the only way
  to get everything that's needed is from displaylink.com.

  I'm reporting this issue while logged in under Xorg because I can't
  report it when logged in with my DisplayLink monitors plugged in under
  Wayland, for obvious reasons. :-/

  ProblemType: BugDistroRelease: Ubuntu 19.10
  Package: mutter 3.34.1-1ubuntu1
  ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
  Uname: Linux 5.3.0-23-generic x86_64
  ApportVersion: 2.20.11-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Nov 20 14:08:21 2019
  InstallationDate: Installed on 2019-09-12 (69 days ago)
  InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 
(20190416)SourcePackage: mutter
  UpgradeStatus: Upgraded to eoan on 2019-09-20 (61 days ago)
  modified.conffile..etc.apport.crashdb.conf: [modified]
  mtime.conffile..etc.apport.crashdb.conf: 2019-10-23T16:51:18.143596

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