<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body><table border="1" cellspacing="0" cellpadding="8"> <tr> <th>Bug ID</th> <td><a class="bz_bug_link bz_status_NEW " title="NEW - kworker uses 100% CPU when using _only_ HDMI output with AMDGPU on Carrizo R7 (vanilla 4.7.4)" href="https://bugs.freedesktop.org/show_bug.cgi?id=97849">97849</a> </td> </tr> <tr> <th>Summary</th> <td>kworker uses 100% CPU when using _only_ HDMI output with AMDGPU on Carrizo R7 (vanilla 4.7.4) </td> </tr> <tr> <th>Product</th> <td>DRI </td> </tr> <tr> <th>Version</th> <td>unspecified </td> </tr> <tr> <th>Hardware</th> <td>x86-64 (AMD64) </td> </tr> <tr> <th>OS</th> <td>Linux (All) </td> </tr> <tr> <th>Status</th> <td>NEW </td> </tr> <tr> <th>Severity</th> <td>major </td> </tr> <tr> <th>Priority</th> <td>medium </td> </tr> <tr> <th>Component</th> <td>DRM/AMDgpu </td> </tr> <tr> <th>Assignee</th> <td>dri-devel@lists.freedesktop.org </td> </tr> <tr> <th>Reporter</th> <td>striker@terranforge.com </td> </tr></table> <p> <div> <pre>This only happen when you push only HDMI output. The strange thing is that it does not happen when I have both local display AND HDMI enabled. I reported this downstream as well: <a href="https://bugzilla.redhat.com/show_bug.cgi?id=1377104">https://bugzilla.redhat.com/show_bug.cgi?id=1377104</a> Here's some perf data using 4.7.4: - 94.23% 0.00% kworker/3:0 [kernel.vmlinux] [k] worker_thread ▒ - worker_thread ▒ - 94.23% process_one_work ▒ - 94.22% amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ - amdgpu_connector_dp_detect ▒ - 94.14% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 80.36% amdgpu_atom_execute_table ▒ - 80.35% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 13.63% __const_udelay ▒ 13.62% delay_mwaitx - 94.23% 0.00% kworker/3:0 [kernel.vmlinux] [k] kthread ▒ kthread ▒ - worker_thread ▒ - 94.23% process_one_work ▒ - 94.22% amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ - amdgpu_connector_dp_detect ▒ - 94.14% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 80.36% amdgpu_atom_execute_table ▒ - 80.35% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 13.63% __const_udelay ▒ 13.62% delay_mwaitx - 94.23% 0.00% kworker/3:0 [kernel.vmlinux] [k] ret_from_fork ▒ ret_from_fork ▒ kthread ▒ - worker_thread ▒ - 94.23% process_one_work ▒ - 94.22% amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ - amdgpu_connector_dp_detect ▒ - 94.14% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 80.36% amdgpu_atom_execute_table ▒ - 80.35% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 13.63% __const_udelay ▒ 13.62% delay_mwaitx - 94.23% 0.00% kworker/3:0 [kernel.vmlinux] [k] process_one_work ▒ - process_one_work ▒ - 94.22% amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ - amdgpu_connector_dp_detect ▒ - 94.14% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 80.36% amdgpu_atom_execute_table ▒ - 80.35% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 13.63% __const_udelay ▒ 13.62% delay_mwaitx - 94.22% 0.00% kworker/3:0 [amdgpu] [k] amdgpu_connector_dp_detect ▒ - amdgpu_connector_dp_detect ▒ - 94.14% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 80.36% amdgpu_atom_execute_table ▒ - 80.35% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 13.63% __const_udelay ▒ 13.62% delay_mwaitx - 94.22% 0.00% kworker/3:0 [drm_kms_helper] [k] drm_helper_hpd_irq_event ▒ drm_helper_hpd_irq_event ▒ - amdgpu_connector_dp_detect ▒ - 94.14% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 80.36% amdgpu_atom_execute_table ▒ - 80.35% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 13.63% __const_udelay ▒ 13.62% delay_mwaitx - 94.22% 0.00% kworker/3:0 [amdgpu] [k] amdgpu_hotplug_work_func ▒ amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ - amdgpu_connector_dp_detect ▒ - 94.14% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 80.36% amdgpu_atom_execute_table ▒ - 80.35% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 13.63% __const_udelay ▒ 13.62% delay_mwaitx - 94.14% 0.00% kworker/3:0 [amdgpu] [k] amdgpu_atombios_encoder_set_edp_panel_power ▒ - 94.14% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 80.36% amdgpu_atom_execute_table ▒ - 80.35% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 13.63% __const_udelay ▒ 13.62% delay_mwaitx - 80.42% 0.00% kworker/3:0 [amdgpu] [k] amdgpu_atom_execute_table ▒ - amdgpu_atom_execute_table ▒ - 80.42% amdgpu_atom_execute_table_locked ▒ - 80.35% atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump - 80.42% 0.99% kworker/3:0 [amdgpu] [k] amdgpu_atom_execute_table_locked ▒ - 79.43% amdgpu_atom_execute_table_locked ▒ - 79.35% atom_op_calltable ▒ - 79.20% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump ▒ - 0.99% ret_from_fork ▒ kthread ▒ worker_thread ▒ process_one_work ▒ amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ amdgpu_connector_dp_detect ▒ amdgpu_atombios_encoder_set_edp_panel_power ▒ amdgpu_atom_execute_table ▒ amdgpu_atom_execute_table_locked ▒ atom_op_calltable ▒ amdgpu_atom_execute_table_locked - 80.35% 0.00% kworker/3:0 [amdgpu] [k] atom_op_calltable ▒ - atom_op_calltable ▒ - 80.19% amdgpu_atom_execute_table_locked ▒ - 78.32% atom_op_test ▒ - 77.46% atom_get_src_int ▒ - 75.86% cail_reg_read ▒ 75.64% amdgpu_mm_rreg ▒ 0.77% atom_op_jump - 78.42% 0.81% kworker/3:0 [amdgpu] [k] atom_op_test ▒ - 77.60% atom_op_test ▒ - 77.48% atom_get_src_int ▒ - 75.87% cail_reg_read ▒ 75.66% amdgpu_mm_rreg ▒ - 0.81% ret_from_fork ▒ kthread ▒ worker_thread ▒ process_one_work ▒ amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ amdgpu_connector_dp_detect ▒ amdgpu_atombios_encoder_set_edp_panel_power ▒ amdgpu_atom_execute_table ▒ amdgpu_atom_execute_table_locked ▒ - atom_op_calltable ▒ - 0.73% amdgpu_atom_execute_table_locked ▒ atom_op_test - 77.54% 1.58% kworker/3:0 [amdgpu] [k] atom_get_src_int ▒ - 75.97% atom_get_src_int ▒ - 75.87% cail_reg_read ▒ 75.66% amdgpu_mm_rreg ◆ - 1.58% ret_from_fork ▒ kthread ▒ worker_thread ▒ process_one_work ▒ amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ amdgpu_connector_dp_detect ▒ amdgpu_atombios_encoder_set_edp_panel_power ▒ amdgpu_atom_execute_table ▒ - amdgpu_atom_execute_table_locked ▒ - 1.57% atom_op_calltable ▒ - amdgpu_atom_execute_table_locked ▒ - 1.51% atom_op_test ▒ atom_get_src_int - 76.00% 0.17% kworker/3:0 [amdgpu] [k] cail_reg_read ▒ - 75.83% cail_reg_read ▒ 75.66% amdgpu_mm_rreg - 75.91% 75.91% kworker/3:0 [amdgpu] [k] amdgpu_mm_rreg ▒ ret_from_fork ▒ kthread ▒ worker_thread ▒ process_one_work ▒ amdgpu_hotplug_work_func ▒ drm_helper_hpd_irq_event ▒ - amdgpu_connector_dp_detect ▒ - 75.88% amdgpu_atombios_encoder_set_edp_panel_power ▒ - 75.73% amdgpu_atom_execute_table ▒ amdgpu_atom_execute_table_locked ▒ atom_op_calltable ▒ amdgpu_atom_execute_table_locked ▒ atom_op_test ▒ - atom_get_src_int ▒ - 75.64% cail_reg_read ▒ amdgpu_mm_rreg</pre> </div> </p> <hr> <span>You are receiving this mail because:</span> <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>