Yep. here, on 20.04 it crashed a few days ago, for the last time. With 22.04.1 
it doesn't crash any longer. 
Though that's not a big help: there is simply no second display. I installed 
the most recent driver from DisplayLink, 5.6.1. There was no error or warning 
message, just that I had to reboot. Did so, and just nothing. Not recognized in 
System settings, and xrandr states:
HDMI-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)

Fortunately, I can exclude Dock, cables and so forth, since it is a
dual-boot to W10. And just rebooting, choosing W10, works flawlessly.

Here it also used to work, before this bug, on a daily basis. I usually
work on a laptop, with lid closed, and all screen content on an external
monitor. Then this bug appeared, and now the bug is gone, the screen
stays black.

Any idea appreciated, what I could do.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mesa in Ubuntu.
https://bugs.launchpad.net/bugs/1871959

Title:
  Crash with SIGABRT in _iris_batch_flush from iris_fence_flush()

Status in Mesa:
  Fix Released
Status in mesa package in Ubuntu:
  Fix Released

Bug description:
  https://errors.ubuntu.com/problem/23a23997d8d3287584722beeaee600306df3a1bf
  https://errors.ubuntu.com/problem/d9ee437c6ea3330d18aecaa0d3e07f71ca0c8d1a
  https://errors.ubuntu.com/problem/a960bab710b867c695551df03b8207cdc0da9a6f

  ---

  nothing particular done to trigger this, just opening the lid
  apparently crashed the x server (ubuntu 20.04); then after reboot
  apport prompted me to report a crash

  ProblemType: Crash
  DistroRelease: Ubuntu 20.04
  Package: xserver-xorg-core 2:1.20.7-2ubuntu2
  ProcVersionSignature: Ubuntu 5.4.0-12.15-generic 5.4.8
  Uname: Linux 5.4.0-12-generic x86_64
  ApportVersion: 2.20.11-0ubuntu25
  Architecture: amd64
  CompositorRunning: None
  CurrentDesktop: GNOME-Greeter:GNOME
  Date: Fri Apr 10 00:50:52 2020
  DistUpgraded: 2019-12-20 18:35:39,979 DEBUG Running PostInstallScript: 
'./xorg_fix_proprietary.py'
  DistributionChannelDescriptor:
   # This is the distribution channel descriptor for the OEM CDs
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-bionic-amd64-20180608-47+north-bay-14-15-15p+X56
  DistroCodename: focal
  DistroVariant: ubuntu
  ExecutablePath: /usr/lib/xorg/Xorg
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (rev 02) 
(prog-if 00 [VGA controller])
     Subsystem: Dell UHD Graphics 620 (Whiskey Lake) [1028:08b9]
  InstallationDate: Installed on 2019-11-27 (134 days ago)
  InstallationMedia: Ubuntu 18.04 "Bionic" - Build amd64 LIVE Binary 
20180608-09:38
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 0bda:5532 Realtek Semiconductor Corp. 
Integrated_Webcam_HD
   Bus 001 Device 003: ID 8087:0029 Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Latitude 5500
  ProcCmdline: /usr/lib/xorg/Xorg vt1 -displayfd 3 -auth 
/run/user/120/gdm/Xauthority -background none -noreset -keeptty -verbose 3
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-12-generic 
root=UUID=559b7a9d-8198-424b-8812-ea72c10f013e ro mem_sleep_default=deep quiet 
splash vt.handoff=7
  Signal: 6
  SourcePackage: xorg-server
  StacktraceTop:
   __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
   __GI_abort () at abort.c:79
   ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
   ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
   ?? () from /usr/lib/x86_64-linux-gnu/dri/iris_dri.so
  Title: Xorg crashed with SIGABRT in __GI_raise()
  UpgradeStatus: Upgraded to focal on 2019-12-20 (111 days ago)
  UserGroups:

  dmi.bios.date: 08/21/2019
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.5.1
  dmi.board.name: 0M14W7
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.5.1:bd08/21/2019:svnDellInc.:pnLatitude5500:pvr:rvnDellInc.:rn0M14W7:rvrA01:cvnDellInc.:ct10:cvr:
  dmi.product.family: Latitude
  dmi.product.name: Latitude 5500
  dmi.product.sku: 08B9
  dmi.sys.vendor: Dell Inc.
  separator:

  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.100-4
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.4-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx 20.0.4-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20190815-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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