This bug is affecting me too on Ubuntu 20.04 on a Macbook Pro 15". Took me several installations and quite some hours to figure out, what the reason for misbehaving and overheating was, should have launched top right away.
For me the workaround with suspending after boot works fine, too. But it is also kind of annoying to suspend once after booting the computer. -- 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/1878919 Title: kworker/0:1+kacpid uses 100% of one CPU core Status in linux package in Ubuntu: Expired Bug description: At some point, kworker/0:1+kacpid starts using 100% of one CPU's core; this can be seen in the top command. I captured some performance data via the following command: $ perf record -g -a sleep 10 Then, perf report gives the following: Samples: 75K of event 'cycles', Event count (approx.): 44710762967 Children Self Command Shared Object Symbol + 65,46% 0,00% kworker/0:1+kac [kernel.kallsyms] [k] ret_from_fork + 65,46% 0,00% kworker/0:1+kac [kernel.kallsyms] [k] kthread + 65,46% 0,00% kworker/0:1+kac [kernel.kallsyms] [k] worker_thread + 65,44% 0,00% kworker/0:1+kac [kernel.kallsyms] [k] process_one_work + 65,44% 0,00% kworker/0:1+kac [kernel.kallsyms] [k] acpi_os_execute_deferred + 65,33% 0,00% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ev_asynch_execute_gpe_method + 65,32% 0,00% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ns_evaluate + 65,26% 0,00% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ps_execute_method + 65,16% 0,06% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ps_parse_aml + 61,00% 0,94% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ps_parse_loop + 37,83% 0,75% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ds_exec_end_op + 18,33% 0,04% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ds_evaluate_name_path + 16,12% 0,23% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ns_lookup + 15,79% 0,20% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ns_search_and_enter + 15,23% 14,99% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ns_search_one_scope + 14,38% 0,00% swapper [kernel.kallsyms] [k] secondary_startup_64 + 14,38% 0,02% swapper [kernel.kallsyms] [k] cpu_startup_entry + 14,31% 0,12% swapper [kernel.kallsyms] [k] do_idle + 13,79% 0,00% swapper [kernel.kallsyms] [k] start_secondary + 12,92% 0,03% swapper [kernel.kallsyms] [k] call_cpuidle + 12,89% 0,00% swapper [kernel.kallsyms] [k] cpuidle_enter + 12,85% 0,05% swapper [kernel.kallsyms] [k] cpuidle_enter_state + 12,35% 2,15% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ut_update_object_reference + 12,05% 0,28% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ex_resolve_to_value + 10,40% 0,04% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ex_resolve_node_to_value + 9,90% 0,44% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ds_create_operand + 9,50% 0,05% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ex_read_data_from_field + 9,39% 0,06% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ex_field_datum_io + 9,26% 0,12% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ex_access_region + 9,23% 0,08% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ps_get_next_namepath + 9,15% 1,28% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ut_update_ref_count.part.0 + 9,01% 0,08% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ev_address_space_dispatch + 8,96% 0,14% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ex_extract_from_field + 8,78% 7,70% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ex_system_memory_space_handler + 7,81% 0,22% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ut_remove_reference + 6,63% 6,43% swapper [kernel.kallsyms] [k] intel_idle + 5,31% 0,68% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ps_create_op + 5,12% 0,08% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ut_add_reference + 4,89% 0,07% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ds_delete_result_if_not_used + 4,71% 0,09% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ds_do_implicit_return + 4,61% 0,17% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ds_is_result_used + 3,91% 3,62% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ut_track_stack_ptr + 3,83% 0,31% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ps_complete_op + 3,39% 0,23% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ps_alloc_op + 3,25% 3,20% kworker/0:1+kac [kernel.kallsyms] [k] _raw_spin_lock_irqsave + 3,23% 0,24% kworker/0:1+kac [kernel.kallsyms] [k] acpi_os_acquire_lock + 3,17% 0,00% kworker/u16:10- [kernel.kallsyms] [k] ret_from_fork + 3,17% 0,00% kworker/u16:10- [kernel.kallsyms] [k] kthread + 3,17% 0,00% kworker/u16:10- [kernel.kallsyms] [k] worker_thread + 3,17% 0,00% kworker/u16:10- [kernel.kallsyms] [k] process_one_work + 3,16% 0,00% kworker/u16:10- [kernel.kallsyms] [k] nv50_disp_atomic_commit_work + 3,14% 0,00% kworker/u16:10- [kernel.kallsyms] [k] nv50_disp_atomic_commit_tail + 3,12% 1,69% kworker/0:1+kac [kernel.kallsyms] [k] acpi_ut_trace_ptr + 3,09% 0,00% kworker/u16:10- [kernel.kallsyms] [k] nv50_wndw_wait_armed + 3,09% 0,00% kworker/u16:10- [kernel.kallsyms] [k] hid_hw_stop + 3,05% 0,01% swapper [kernel.kallsyms] [k] ret_from_intr + 3,05% 0,00% swapper [kernel.kallsyms] [k] do_IRQ + 3,02% 0,00% swapper [kernel.kallsyms] [k] handle_irq_event + 3,02% 0,00% swapper [kernel.kallsyms] [k] handle_irq_event_percpu There is the following in dmesg, I do not know whether it's related to the issue: [31046.072827] pci_bus 0000:02: Allocating resources [31046.072949] pcieport 0000:00:1c.0: bridge window [io 0x1000-0x0fff] to [bus 02] add_size 1000 [31046.072951] pcieport 0000:00:1c.0: bridge window [mem 0x00100000-0x000fffff 64bit pref] to [bus 02] add_size 200000 add_align 100000 [31046.072957] pci_bus 0000:05: Allocating resources [31046.072965] pcieport 0000:00:1c.0: BAR 15: assigned [mem 0xaa000000-0xaa1fffff 64bit pref] [31046.072968] pcieport 0000:00:1c.0: BAR 13: assigned [io 0x2000-0x2fff] [31046.073030] pcieport 0000:00:1c.4: AER: Corrected error received: 0000:00:1c.4 [31046.073037] pcieport 0000:00:1c.4: AER: PCIe Bus Error: severity=Corrected, type=Data Link Layer, (Transmitter ID) [31046.073039] pcieport 0000:00:1c.4: AER: device [8086:a114] error status/mask=00001000/00002000 [31046.073041] pcieport 0000:00:1c.4: AER: [12] Timeout [31046.073046] pcieport 0000:00:1c.4: AER: Corrected error received: 0000:00:1c.4 [31046.073050] pcieport 0000:00:1c.4: AER: can't find device of ID00e4 [31090.841307] pcieport 0000:00:1c.4: AER: Corrected error received: 0000:00:1c.4 [31090.841311] pcieport 0000:00:1c.4: AER: PCIe Bus Error: severity=Corrected, type=Physical Layer, (Receiver ID) [31090.841313] pcieport 0000:00:1c.4: AER: device [8086:a114] error status/mask=00000001/00002000 [31090.841315] pcieport 0000:00:1c.4: AER: [ 0] RxErr [31091.128072] pci_bus 0000:02: Allocating resources [31091.128184] pci_bus 0000:05: Allocating resources ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-generic 5.4.0.29.34 ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30 Uname: Linux 5.4.0-29-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: mavi 2209 F.... pulseaudio /dev/snd/controlC0: mavi 2209 F.... pulseaudio /dev/snd/controlC2: mavi 2209 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Fri May 15 16:33:39 2020 HibernationDevice: RESUME=/dev/mapper/vg0-lv0--swap InstallationDate: Installed on 2016-09-05 (1348 days ago) InstallationMedia: Ubuntu-Server 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) MachineType: LENOVO 20EN0005MS ProcFB: 0 nouveaudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-29-generic root=/dev/mapper/vg0-lv1--root ro splash ipv6.disable=1 nouveau.modeset=1 vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.4.0-29-generic N/A linux-backports-modules-5.4.0-29-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: Upgraded to focal on 2020-03-20 (55 days ago) dmi.bios.date: 12/06/2019 dmi.bios.vendor: LENOVO dmi.bios.version: N1EET87W (1.60 ) dmi.board.asset.tag: Not Available dmi.board.name: 20EN0005MS dmi.board.vendor: LENOVO dmi.board.version: SDK0J40705 WIN dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrN1EET87W(1.60):bd12/06/2019:svnLENOVO:pn20EN0005MS:pvrThinkPadP50:rvnLENOVO:rn20EN0005MS:rvrSDK0J40705WIN:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad P50 dmi.product.name: 20EN0005MS dmi.product.sku: LENOVO_MT_20EN_BU_Think_FM_ThinkPad P50 dmi.product.version: ThinkPad P50 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1878919/+subscriptions -- Mailing list: 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