Public bug reported:

I use Kubuntu 20.04.1 on Thinpad T495 with encrypted disk (LVMS) and
finger print reader.

PROBLEM:
1. I boot the laptop and can work
2. I log my user out and try to log in again with te password
3. I enter the password and press enter
4. The screen freezes and shows the login screen. It can only be killed and 
rebooted. 

Also, the finger print reader works everywhere, but not in the situation
above. These are the seetings of my common-auth file:

# here are the per-package modules (the "Primary" block)
auth    [success=2 default=ignore]      pam_fprintd.so max_tries=1 timeout=10 # 
debug
auth    [success=1 default=ignore]      pam_unix.so nullok_secure try_first_pass

But I do NOT think that the problem is related to the fingerprint
reader.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-45.49-generic 5.4.55
Uname: Linux 5.4.0-45-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.8
Architecture: amd64
BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: KDE
Date: Tue Sep  1 13:38:09 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev d2) (prog-if 
00 [VGA controller])
   Subsystem: Lenovo Picasso [17aa:5125]
InstallationDate: Installed on 2020-08-31 (0 days ago)
InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 (20200731)
MachineType: LENOVO 20NKS01Y00
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-45-generic 
root=/dev/mapper/vgkubuntu-root ro quiet splash iommu=soft vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/19/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: R12ET50W(1.20 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20NKS01Y00
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrR12ET50W(1.20):bd02/19/2020:svnLENOVO:pn20NKS01Y00:pvrThinkPadT495:rvnLENOVO:rn20NKS01Y00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T495
dmi.product.name: 20NKS01Y00
dmi.product.sku: LENOVO_MT_20NK_BU_Think_FM_ThinkPad T495
dmi.product.version: ThinkPad T495
dmi.sys.vendor: LENOVO
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 2:1.20.8-2ubuntu2.2
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

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


** Tags: amd64 apport-bug focal ubuntu

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You received this bug notification because you are a member of Desktop
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https://bugs.launchpad.net/bugs/1893774

Title:
  Screen freeze when loging in after a log out

Status in xorg package in Ubuntu:
  New

Bug description:
  I use Kubuntu 20.04.1 on Thinpad T495 with encrypted disk (LVMS) and
  finger print reader.

  PROBLEM:
  1. I boot the laptop and can work
  2. I log my user out and try to log in again with te password
  3. I enter the password and press enter
  4. The screen freezes and shows the login screen. It can only be killed and 
rebooted. 

  Also, the finger print reader works everywhere, but not in the
  situation above. These are the seetings of my common-auth file:

  # here are the per-package modules (the "Primary" block)
  auth  [success=2 default=ignore]      pam_fprintd.so max_tries=1 timeout=10 # 
debug
  auth  [success=1 default=ignore]      pam_unix.so nullok_secure try_first_pass

  But I do NOT think that the problem is related to the fingerprint
  reader.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-45.49-generic 5.4.55
  Uname: Linux 5.4.0-45-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.8
  Architecture: amd64
  BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: KDE
  Date: Tue Sep  1 13:38:09 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  ExtraDebuggingInterest: No
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev d2) (prog-if 
00 [VGA controller])
     Subsystem: Lenovo Picasso [17aa:5125]
  InstallationDate: Installed on 2020-08-31 (0 days ago)
  InstallationMedia: Kubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 
(20200731)
  MachineType: LENOVO 20NKS01Y00
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-45-generic 
root=/dev/mapper/vgkubuntu-root ro quiet splash iommu=soft vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 02/19/2020
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R12ET50W(1.20 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20NKS01Y00
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrR12ET50W(1.20):bd02/19/2020:svnLENOVO:pn20NKS01Y00:pvrThinkPadT495:rvnLENOVO:rn20NKS01Y00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T495
  dmi.product.name: 20NKS01Y00
  dmi.product.sku: LENOVO_MT_20NK_BU_Think_FM_ThinkPad T495
  dmi.product.version: ThinkPad T495
  dmi.sys.vendor: LENOVO
  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 2:1.20.8-2ubuntu2.2
  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

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