** Tags added: oem-priority

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https://bugs.launchpad.net/bugs/2044377

Title:
  ThinkPad PrivacyScreen handle /proc/acpi/ibm/lcdshadow does not toggle
  hardware

Status in linux package in Ubuntu:
  New

Bug description:
  My laptop is equipped with PrivacyGuard, however the hardware feature
  does not work since one upgrade in Ubuntu 23.04. I just upgraded to
  23.10 and this issue is still not fixed. It used to work when I was
  using 22.04.

  I have tested writing to the procfs interface directly: `echo 0 >
  /proc/acpi/ibm/lcdshadow` This command have no effect, even though the
  status `cat /proc/acpi/ibm/lcdshadow` is changed.

  I also tried rebooting into the UEFI setup, then pressing Ctrl+D (the
  PrivacyGuard hotkey). This works as expected. (Toggles the
  PrivacyGuard.)

  Currently, under 23.10, the PrivacyGuard seemed to be stuck on the
  "on" state.

  Ubuntu release: 23.10
  Kernel version: 6.5.0-13-generic

  ProblemType: Bug
  DistroRelease: Ubuntu 23.10
  Package: linux-image-6.5.0-13-generic 6.5.0-13.13
  ProcVersionSignature: Ubuntu 6.5.0-13.13-generic 6.5.3
  Uname: Linux 6.5.0-13-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.27.0-0ubuntu5
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: KDE
  Date: Thu Nov 23 21:11:40 2023
  HibernationDevice: RESUME=none
  InstallationDate: Installed on 2021-12-17 (706 days ago)
  InstallationMedia: Ubuntu 21.10 "Impish Indri" - Release amd64 (20211012)
  MachineType: {report['dmi.sys.vendor']} {report['dmi.product.name']}
  ProcFB: 0 amdgpudrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_vt52bg@/vmlinuz-6.5.0-13-generic 
root=ZFS=rpool/ROOT/ubuntu_vt52bg ro quiet splash vt.handoff=1
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No 
PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-6.5.0-13-generic N/A
   linux-backports-modules-6.5.0-13-generic  N/A
   linux-firmware                            20230919.git3672ccab-0ubuntu2.2
  SourcePackage: linux
  UpgradeStatus: Upgraded to mantic on 2023-10-31 (23 days ago)
  dmi.bios.date: 06/27/2022
  dmi.bios.release: 1.21
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R1NET51W (1.21)
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20XHCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0R32862 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.ec.firmware.release: 1.21
  dmi.modalias: 
dmi:bvnLENOVO:bvrR1NET51W(1.21):bd06/27/2022:br1.21:efr1.21:svnLENOVO:pn20XHCTO1WW:pvrThinkPadX13Gen2a:rvnLENOVO:rn20XHCTO1WW:rvrSDK0R32862WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20XH_BU_Think_FM_ThinkPadX13Gen2a:
  dmi.product.family: ThinkPad X13 Gen 2a
  dmi.product.name: 20XHCTO1WW
  dmi.product.sku: LENOVO_MT_20XH_BU_Think_FM_ThinkPad X13 Gen 2a
  dmi.product.version: ThinkPad X13 Gen 2a
  dmi.sys.vendor: LENOVO

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