Computer crashing when exiting the lock screen after login, random admin authentication window stuck on the screen.

[sepukkuhero]

Ubuntu 20.04.1 LTS

xorg:
  Instalado: 1:7.7+19ubuntu14
  Candidato: 1:7.7+19ubuntu14
  Tabela de versão:
 *** 1:7.7+19ubuntu14 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

Sometimes when I lock the screen or suspend the computer (I'm not sure if both or just lock) and after I log in to my user again, a window asking for the administrator password appears. This window is located in the upper left corner of the screen and is not clickable. I try to enter the password or cancel it but it is impossible, it is as if after the screen lock that window would get stuck ...

Result: if I can use the computer normally, I cannot remove the window, which occupies a significant part of the screen. Sometimes the situation gets worse and everything starts to stall. In such cases, I can only move the mouse, without being able to interact. Everything is stuck and never comes back. I can only fix this problem by restarting the computer.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.12
Architecture: amd64
BootLog: Error: [Errno 13] Permissão negada: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Nov 22 17:35:26 2020
DistUpgraded: 2020-10-23 13:38:17,737 DEBUG /openCache(), new cache size 66390
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GpuHangFrequency: Once a week
GpuHangReproducibility: Occurs more often under certain circumstances
GpuHangStarted: I don't know
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] [1002:699f] (rev c7) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Lexa PRO [Radeon 540/540X/550/550X / RX 540X/550/550X] [1043:0513]
InstallationDate: Installed on 2020-07-24 (121 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: Gigabyte Technology Co., Ltd. GA-78LMT-USB3 6.0
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-54-generic root=UUID=b12510e7-1702-4d36-80bc-11251ef87185 ro quiet splash radeon.audio=1 vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: Upgraded to focal on 2020-10-23 (30 days ago)
dmi.bios.date: 11/25/2014
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F2
dmi.board.name: GA-78LMT-USB3 6.0
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: SEx
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF2:bd11/25/2014:svnGigabyteTechnologyCo.,Ltd.:pnGA-78LMT-USB36.0:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-78LMT-USB36.0:rvrSEx:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-78LMT-USB3 6.0
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.4
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+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1824874, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.