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Results: > > We call > https://elixir.bootlin.com/linux/v6.18/source/kernel/power/hibernate.c#L870 , > it calls > https://elixir.bootlin.com/linux/v6.18/source/kernel/power/hibernate.c#L723 , > it calls > https://elixir.bootlin.com/linux/v6.18/source/kernel/power/hibernate.c#L636 , > it calls dpm_suspend > https://elixir.bootlin.com/linux/v6.18/source/drivers/base/power/main.c#L2265 , > that dpm_suspend returns error, and this error leads to > "Wakeup event detected during hibernation" message. > > Any further pointers? How to debug? > If you haven't already; turn on /sys/power/pm_debug_messages and /sys/power/pm_print_times. This should help clarify the last functions that are run and any debug level PM related messages that are emitted that lead to the failure. You can also check /sys/power/pm_wakeup_irq after the failure to confirm which interrupt woke the system (assuming that was the source of the early wakeup event).