https://bugzilla.kernel.org/show_bug.cgi?id=198745 --- Comment #17 from Harry Wentland (harry.wentland@xxxxxxx) --- Thanks for checking. Non-DC display driver and DC do detection somewhat differently. It's somewhat difficult to say what's going wrong there. Do you see different behavior when booting headless, then plugging in the display? If you're interested in debugging I'd probably use ftrace to get started, checking that the functions get hit: - handle_hpd_irq (only on hotplug) - dc_link_detect (crucial to detection) - dc_sink_create - dm_helpers_read_local_edid - drm_get_edid - dm_helpers_parse_edid_caps - amdgpu_dm_update_connector_after_detect - drm_mode_connector_update_edid_property Script to do ftrace debugging (run as root): #!/bin/bash cd /sys/kernel/debug/tracing/ echo handle_hpd_irq >> set_ftrace_filter echo dc_link_detect >> set_ftrace_filter echo dc_sink_create >> set_ftrace_filter echo dm_helpers_read_local_edid >> set_ftrace_filter echo drm_get_edid >> set_ftrace_filter echo dm_helpers_parse_edid_caps >> set_ftrace_filter echo amdgpu_dm_update_connector_after_detect >> set_ftrace_filter echo drm_mode_connector_update_edid_property >> set_ftrace_filter echo function_graph >> current_tracer echo '' >> trace cat trace_pipe -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
