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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