[Bug 2077061] Re: Ubuntu 24.04 showed CXL related complaining messages when CXL capable root port did not attach CXL device

Hi Philip,

FYI, we had some progress...

Link to the patch:

https://lore.kernel.org/all/671c1503b2702_203f412945a@iweiny-
mobl.notmuch/T/#m4db285d8318895bc36e9b06417fb185b0a76dbf6

Could you please check when will Ubuntu integrate this patch?

Thanks.

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https://bugs.launchpad.net/bugs/2077061

Title:
Ubuntu 24.04 showed CXL related complaining messages when CXL capable
root port did not attach CXL device

Status in linux package in Ubuntu:
New

Bug description:
Ubuntu 24.04 showed CXL related complaining messages (when CXL root
port did not attach CXL device) such as below messages (refer to
attached dmesg file):


Couldn't locate the CXL.cache and CXL.mem capability array header.
HDM decoder capability not found

For more details, Please refer to the attached dmesg file

How reproducible:
100%

Steps to reproduce

1. Install Ubuntu 24.04 on a Lenovo server which is CXL enabled by
Intel CPU and Lenovo UEFI, but there is no CXL device attached in this
server.

2. Check the dmesg.

3. The above error messages are seen in the dmesg file.
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Aug 28 03:14 seq
crw-rw---- 1 root audio 116, 33 Aug 28 03:14 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/timer', '/dev/snd/seq'] failed with exit code 1:
CRDA: N/A
CasperMD5CheckResult: pass
DistroRelease: Ubuntu 24.04
InstallationDate: Installed on 2024-08-28 (0 days ago)
InstallationMedia: Ubuntu-Server 24.04 LTS "Noble Numbat" - Release amd64 (20240423)
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Lenovo ThinkSystem SR650 V4,Processor board,BHS,2U,Renesas
Package: linux (not installed)
PciMultimedia:

ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm
XDG_RUNTIME_DIR=<set>
ProcFB: 0 astdrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-41-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro
ProcVersionSignature: Ubuntu 6.8.0-41.41-generic 6.8.12
RelatedPackageVersions:
linux-restricted-modules-6.8.0-41-generic N/A
linux-backports-modules-6.8.0-41-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.2
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
Tags: noble
Uname: Linux 6.8.0-41-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: N/A
_MarkForUpload: True
dmi.bios.date: 08/26/2024
dmi.bios.release: 0.60
dmi.bios.vendor: Lenovo
dmi.bios.version: IHE105M-0.60
dmi.board.name: SB27B70050
dmi.board.vendor: Lenovo
dmi.board.version: 2
dmi.chassis.type: 23
dmi.chassis.vendor: Lenovo
dmi.chassis.version: None
dmi.ec.firmware.release: 0.46
dmi.modalias: dmi:bvnLenovo:bvrIHE105M-0.60:bd08/26/2024:br0.60:efr0.46:svnLenovo:pnThinkSystemSR650V4,Processorboard,BHS,2U,Renesas:pvr2:rvnLenovo:rnSB27B70050:rvr2:cvnLenovo:ct23:cvrNone:sku7DGCCTO2WW:
dmi.product.family: ThinkSystem
dmi.product.name: ThinkSystem SR650 V4,Processor board,BHS,2U,Renesas
dmi.product.sku: 7DGCCTO2WW
dmi.product.version: 2
dmi.sys.vendor: Lenovo

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