[Bug 1973098] Re: [i915] Intermittent freezing and LSPCON init failed kernel messages

FWIW I also just tried 24.04 as well as the latest BIOS update (1.37).

The issue appears to be significantly worse. I was initially unable to
boot into a desktop environment at all.

Changing the BIOS setting for Display to Discrete (from Hybrid) meant
that everything worked but monitor detection was broken in Wayland so
I've stayed with Xorg where it is only partially broken.

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Title:
[i915] Intermittent freezing and LSPCON init failed kernel messages

Status in linux package in Ubuntu:
Confirmed
Status in linux-signed-oem-5.14 package in Ubuntu:
Confirmed

Bug description:
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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