Public bug reported:

Hardware: Lenovo ThinkPad model 20ST0055AU

Boot messages show:
[    6.397804] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
[    6.397901] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 0

During normal operation there will intermittently be a freeze for a
second or two and then more of these messages display in the kernel
logs:

[  505.487006] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
[  505.487072] [drm:lspcon_resume [i915]] *ERROR* LSPCON init failed on port D
[  506.747930] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
[  506.748018] [drm:lspcon_resume [i915]] *ERROR* LSPCON init failed on port D

The system will then become operational again.

The system is still usable, but it is annoying.

I've switched onto this OEM kernel from the generic kernel (5.13), as I
had other problems with 5.13 regarding external displays not coming back
after idle timeouts.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: linux-image-5.14.0-1036-oem 5.14.0-1036.40
ProcVersionSignature: Ubuntu 5.14.0-1036.40-oem 5.14.21
Uname: Linux 5.14.0-1036-oem x86_64
ApportVersion: 2.20.11-0ubuntu27.23
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Thu May 12 10:29:31 2022
InstallationDate: Installed on 2021-05-05 (371 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
SourcePackage: linux-signed-oem-5.14
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-signed-oem-5.14 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Description changed:

+ Hardware: Lenovo ThinkPad model 20ST0055AU
+ 
  Boot messages show:
  [    6.397804] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
  [    6.397901] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on 
minor 0
  
  During normal operation there will intermittently be a freeze for a
  second or two and then more of these messages display in the kernel
  logs:
  
  [  505.487006] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
  [  505.487072] [drm:lspcon_resume [i915]] *ERROR* LSPCON init failed on port D
  [  506.747930] [drm:lspcon_init [i915]] *ERROR* Failed to probe lspcon
  [  506.748018] [drm:lspcon_resume [i915]] *ERROR* LSPCON init failed on port D
  
  The system will then become operational again.
  
  The system is still usable, but it is annoying.
  
  I've switched onto this OEM kernel from the generic kernel (5.13), as I
  had other problems with 5.13 regarding external displays not coming back
  after idle timeouts.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.14.0-1036-oem 5.14.0-1036.40
  ProcVersionSignature: Ubuntu 5.14.0-1036.40-oem 5.14.21
  Uname: Linux 5.14.0-1036-oem x86_64
  ApportVersion: 2.20.11-0ubuntu27.23
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: ubuntu:GNOME
  Date: Thu May 12 10:29:31 2022
  InstallationDate: Installed on 2021-05-05 (371 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  SourcePackage: linux-signed-oem-5.14
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1973098

Title:
  Intermittent freezing and LSPCON init failed kernel messages

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