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The bug is that all at a sudden gnome reset to login screen. When i log
again, the only "sound output" allowed is simulation, my devices are not
displayed.

I'm using 
- Ubuntu 20.04 (I upgraded from 18 some months ago, I don't think this bug was 
present at that moment but i used less my ubuntu station). 
- Portable PC

The bug happen
- When I use my PC with screen pluged directly : some times
- When I use my docking station with 144Hz display in DVI 
(https://i-tec.pro/fr/produkt/u3hdmidvidock-4/) : quite frequently
- When à Use my docking station and watch some full screen video : very 
frequently

It seems to be linked to displayLink use, but not only because it happen
too when i don't use the docking station. It seems to be frequently when
i "Stress" the screen.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: gnome-shell 3.36.4-1ubuntu1~20.04.2
ProcVersionSignature: Ubuntu 5.4.0-65.73-generic 5.4.78
Uname: Linux 5.4.0-65-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu Feb  4 10:17:54 2021
DisplayManager: gdm3
EcryptfsInUse: Yes
InstallationDate: Installed on 2017-11-08 (1183 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
RelatedPackageVersions: mutter-common 3.36.7+git20201123-0.20.04.1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to focal on 2020-07-01 (217 days ago)

** Affects: mutter (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug displaylink focal
-- 
kernel: i915 0000:00:02.0: Resetting rcs0 for hang on rcs0 ... and then the 
display server crashes
https://bugs.launchpad.net/bugs/1914573
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