I do not know that there is anything necessary to do here.

Per the discussion for that patch, the warning is just a warning and
while it is probably elevated higher than it should be (the patch only
seems to downgrade it to a DEBUG level message) it is innocuous.

The patch is landed in 6.13, for reference:
commit 9474d586819940f00a98dd98015fe456f9b35452
Author: Coly Li <col...@suse.de>
Date:   Mon Oct 21 13:04:43 2024 +0800

    cxl: downgrade a warning message to debug level in 
cxl_probe_component_regs()
    
    In cxl_probe_component_regs() the error message "Couldn't locate the
    CXL.cache and CXL.mem capability array header." is potentially a false
    positive error condition.
    
    Downgrade the message from error level to debug level by using dev_dbg()
    to print the message, and the end users won't worry about the message
    anymore.
    
    [djbw/iweiny: Fix up changelog]
    
    Reported-by: Kelvin Shieh <ksh...@lenovo.com>
    Signed-off-by: Coly Li <col...@suse.de>
    Cc: Dan Williams <dan.j.willi...@intel.com>
    Cc: Jonathan Cameron <jonathan.came...@huawei.com>
    Cc: Alison Schofield <alison.schofi...@intel.com>
    Reviewed-by: Dan Williams <dan.j.willi...@intel.com>
    Link: https://patch.msgid.link/20241021050443.318712-1-col...@suse.de
    Signed-off-by: Ira Weiny <ira.we...@intel.com>
    Signed-off-by: Dave Jiang <dave.ji...@intel.com>

We will take a look at this, but it is not a very high prioirty and may
not be accepted into the Ubuntu kernels.


** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

** Also affects: linux (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Oracular)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Noble)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Oracular)
   Importance: Undecided => Low

** Changed in: linux (Ubuntu Noble)
       Status: New => Confirmed

** Changed in: linux (Ubuntu Oracular)
       Status: New => Confirmed

** Also affects: linux (Ubuntu Plucky)
   Importance: Low
     Assignee: Philip Cox (philcox)
       Status: Confirmed

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Confirmed
Status in linux source package in Noble:
  Confirmed
Status in linux source package in Oracular:
  Confirmed
Status in linux source package in Plucky:
  Confirmed

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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