I'd like to report one more instance of this bug. BUT perhaps more importantly pass on a condition that seems to trigger these ACPI errors at boot time (which you may or may not realize) and which might affect your continued approach to fixing.
I use an old Dell t7400 and just recently decided to activate their TPM (trusted platform module) in my bios. I had never received any of these boot ACPI errors until I activated the TPM (which uses the broadcom LAN chip for crypto key generation). Immediately after activation, the ACPI errors unique to my system were reported at boot through dmesg. Upon deactivation AND DISABLING the TPM function (there are 2 distinct steps needed) the boot time ACPI errors cease being reported. =============== ACPI BIOS Error (bug): Could not resolve symbol [\_PR.CPU7._PCT.CFGD], AE_NOT_FOUND (20210730/psargs-330) ACPI Error: Aborting method \_PR.CPU6._PCT due to previous error (AE_NOT_FOUND) (20210730/psparse-529) ACPI BIOS Error (bug): Could not resolve symbol [\_PR.CPU6._PCT.CFGD], AE_NOT_FOUND (20210730/psargs-330) and repeated for each core to 0 ...... ACPI Error: Aborting method \_PR.CPU0._PCT due to previous error (AE_NOT_FOUND) (20210730/psparse-529) ACPI BIOS Error (bug): Could not resolve symbol [\_PR.CPU0._PCT.CFGD], AE_NOT_FOUND (20210730/psargs-330) ================ my relevant machine info ======== Kernel: 5.15.0-100-generic x86_64 bits: 64 compiler: gcc v: 11.4.0 Desktop: Cinnamon 6.0.4 tk: GTK 3.24.33 wm: muffin vt: 7 dm: LightDM 1.30.0 Distro: Linux Mint 21.3 Virginia base: Ubuntu 22.04 jammy Machine: Type: Desktop System: Dell product: Precision WorkStation T7400 v: N/A serial: <superuser required> Chassis: type: 7 serial: <superuser required> Mobo: Dell model: 0RW199 serial: <superuser required> BIOS: Dell v: A11 date: 04/30/2012 CPU: Info: 2x 4-core model: Intel Xeon E5450 bits: 64 type: MCP SMP smt: <unsupported> arch: Core Yorkfield rev: A cache: L1: 2x 256 KiB (512 KiB) L2: 2x 12 MiB (24 MiB) Speed (MHz): avg: 2693 high: 3591 min/max: 2000/3000 cores: 1: 3591 2: 2394 3: 2394 4: 2394 5: 3591 6: 2394 7: 2394 8: 2394 bogomips: 57457 Flags: ht lm nx pae sse sse2 sse3 sse4_1 ssse3 vmx Network: Device-1: Broadcom NetXtreme BCM5754 Gigabit Ethernet PCI Express vendor: Dell driver: tg3 v: kernel pcie: speed: 2.5 GT/s lanes: 1 port: N/A bus-ID: 08:00.0 chip-ID: 14e4:167a class-ID: 0200 ===== I hope this is useful information. -- 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/1983180 Title: ACPI Error _CPC not found Status in Linux: Confirmed Status in linux package in Ubuntu: Confirmed Bug description: just recently (I guess since the last update) I get a few ACPI error messages during start up. Those are also visible with dmesg: ... [ 0.713907] ACPI: AC: AC Adapter [AC] (on-line) [ 0.713978] input: Sleep Button as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0E:00/input/input0 [ 0.714011] ACPI: button: Sleep Button [SLPB] [ 0.714040] input: Lid Switch as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0D:00/input/input1 [ 0.714061] ACPI: button: Lid Switch [LID] [ 0.714087] input: Power Button as /devices/LNXSYSTM:00/LNXPWRBN:00/input/input2 [ 0.714105] ACPI: button: Power Button [PWRF] [ 0.714187] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.714199] No Local Variables are initialized for Method [_CPC] [ 0.714201] No Arguments are initialized for method [_CPC] [ 0.714203] ACPI Error: Aborting method \_SB.PR01._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.714395] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.714404] No Local Variables are initialized for Method [_CPC] [ 0.714405] No Arguments are initialized for method [_CPC] [ 0.714407] ACPI Error: Aborting method \_SB.PR02._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.714480] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.714488] No Local Variables are initialized for Method [_CPC] [ 0.714490] No Arguments are initialized for method [_CPC] [ 0.714492] ACPI Error: Aborting method \_SB.PR03._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.714640] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.714651] No Local Variables are initialized for Method [_CPC] [ 0.714653] No Arguments are initialized for method [_CPC] [ 0.714655] ACPI Error: Aborting method \_SB.PR04._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.714940] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.714952] No Local Variables are initialized for Method [_CPC] [ 0.714953] No Arguments are initialized for method [_CPC] [ 0.714955] ACPI Error: Aborting method \_SB.PR05._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.715106] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.715118] No Local Variables are initialized for Method [_CPC] [ 0.715119] No Arguments are initialized for method [_CPC] [ 0.715121] ACPI Error: Aborting method \_SB.PR06._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.715309] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.715321] No Local Variables are initialized for Method [_CPC] [ 0.715322] No Arguments are initialized for method [_CPC] [ 0.715324] ACPI Error: Aborting method \_SB.PR07._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.715611] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.715623] No Local Variables are initialized for Method [_CPC] [ 0.715624] No Arguments are initialized for method [_CPC] [ 0.715626] ACPI Error: Aborting method \_SB.PR08._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.716055] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.716067] No Local Variables are initialized for Method [_CPC] [ 0.716069] No Arguments are initialized for method [_CPC] [ 0.716071] ACPI Error: Aborting method \_SB.PR09._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.716360] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.716371] No Local Variables are initialized for Method [_CPC] [ 0.716373] No Arguments are initialized for method [_CPC] [ 0.716375] ACPI Error: Aborting method \_SB.PR10._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.716669] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PR00._CPC], AE_NOT_FOUND (20210730/psargs-330) [ 0.716681] No Local Variables are initialized for Method [_CPC] [ 0.716682] No Arguments are initialized for method [_CPC] [ 0.716684] ACPI Error: Aborting method \_SB.PR11._CPC due to previous error (AE_NOT_FOUND) (20210730/psparse-529) [ 0.720501] thermal LNXTHERM:00: registered as thermal_zone0 [ 0.720504] ACPI: thermal: Thermal Zone [THM0] (64 C) ... Searching the internet shows that many people with different computers are affected by that. Probably it's a regression in the Linux kernel as described at: https://bugzilla.kernel.org/show_bug.cgi?id=213023 ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: linux-image-5.15.0-43-generic 5.15.0-43.46 ProcVersionSignature: Ubuntu 5.15.0-43.46-generic 5.15.39 Uname: Linux 5.15.0-43-generic x86_64 NonfreeKernelModules: nvidia_modeset nvidia ApportVersion: 2.20.11-0ubuntu82.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: cm 2717 F.... pulseaudio /dev/snd/controlC1: cm 2717 F.... pulseaudio CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Sat Jul 30 16:16:46 2022 HibernationDevice: #RESUME=UUID=9cd06200-ed0e-4f66-9baa-a3977c6b59e0 RESUME=/dev/mapper/GROUP-SWAP InstallationDate: Installed on 2018-10-10 (1388 days ago) InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) MachineType: LENOVO 20MBCTO1WW ProcFB: 0 EFI VGA ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-43-generic root=/dev/mapper/GROUP-ROOT ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.15.0-43-generic N/A linux-backports-modules-5.15.0-43-generic N/A linux-firmware 20220329.git681281e4-0ubuntu3.3 SourcePackage: linux UpgradeStatus: Upgraded to jammy on 2022-07-24 (5 days ago) dmi.bios.date: 06/10/2022 dmi.bios.release: 1.47 dmi.bios.vendor: LENOVO dmi.bios.version: N2CET64W (1.47 ) dmi.board.asset.tag: Not Available dmi.board.name: 20MBCTO1WW dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.ec.firmware.release: 1.16 dmi.modalias: dmi:bvnLENOVO:bvrN2CET64W(1.47):bd06/10/2022:br1.47:efr1.16:svnLENOVO:pn20MBCTO1WW:pvrThinkPadP72:rvnLENOVO:rn20MBCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20MB_BU_Think_FM_ThinkPadP72: dmi.product.family: ThinkPad P72 dmi.product.name: 20MBCTO1WW dmi.product.sku: LENOVO_MT_20MB_BU_Think_FM_ThinkPad P72 dmi.product.version: ThinkPad P72 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1983180/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp