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

Hoping to see the issue go away with the new Ubuntu 24.04 on a HP HP
ProDesk 400 G3 DM/82A5 and it uses Intel HD Graphics 630. But nope still
happens. I needed to pull the power for a bit before screen would come
back properly. Is there additional information needed to troubleshoot
the issue?

024-04-25T19:09:21.155484-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* LSPCON mode hasn't settled
2024-04-25T19:09:21.429475-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* LSPCON mode change timed out
2024-04-25T19:09:21.429481-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* LSPCON mode change failed
2024-04-25T19:09:21.429482-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* LSPCON resume failed
2024-04-25T19:09:21.438472-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
2024-04-25T19:09:21.456511-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* Link Training Unsuccessful
2024-04-25T19:09:23.289474-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* LSPCON mode hasn't settled
2024-04-25T19:09:23.572475-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* LSPCON mode change timed out
2024-04-25T19:09:23.572480-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* LSPCON mode change failed
2024-04-25T19:09:23.572482-05:00 ProDesk400 kernel: i915 0000:00:02.0: [drm] *ERROR* LSPCON resume failed

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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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