Ubuntu

kworker uses a full cpu core constantly

Asked by Andrew Ellison

When I start up ubuntu on my Acer laptop, a kworker process uses 95-100% of the first cpu core at all times and never stops. Following the advice of stackoverflow, I used perf to trace back to pci_conf1_read, raw_pci_read. I think this is the root of the problem, but don't know how to fix it.

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Andrew Ellison (aellison42) said : 		#1

Output of the perf trace, not sure if this is helpful...
95.52% worker_thread ▒
      - 95.44% process_one_work ▒
         - acpi_os_execute_deferred ▒
            - 94.80% acpi_ev_asynch_execute_gpe_method ▒
               - 94.73% acpi_ns_evaluate ▒
                  - 94.47% acpi_ps_execute_method ▒
                     - 94.30% acpi_ps_parse_aml ▒
                        - 93.56% acpi_ps_parse_loop ▒
                           - 77.88% acpi_ds_exec_end_op ▒
                              - 69.64% acpi_ds_evaluate_name_path ▒
                                 - 63.04% acpi_ex_resolve_to_value ▒
                                    - 62.90% acpi_ex_resolve_node_to_value ▒
                                       - 62.81% acpi_ex_read_data_from_field ▒
                                          - 62.36% acpi_ex_extract_from_field ▒
                                             - 61.82% acpi_ex_field_datum_io ▒
                                                - 61.70% acpi_ex_access_region ▒
                                                   - 61.50% acpi_ev_address_space_dispatch ▒
                                                      - 61.25% acpi_ex_pci_config_space_handler ▒
                                                         - 61.22% acpi_os_read_pci_configuration ▒
                                                            - 61.08% raw_pci_read ▒
                                                                 61.02% pci_conf1_read

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Launchpad Janitor (janitor) said : 		#2

This question was expired because it remained in the 'Open' state without activity for the last 15 days.