CONFIG_PM_TRACE_RTC: Suspend/resume event tracing

General informations

The Linux kernel configuration item CONFIG_PM_TRACE_RTC:

• prompt: Suspend/resume event tracing
• type: bool
• depends on: ( CONFIG_PM_SLEEP_DEBUG ) && ( CONFIG_X86 )
• defined in kernel/power/Kconfig
• found in Linux kernels: 2.6.25–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12

Help text

This enables some cheesy code to save the last PM event point in the RTC across reboots, so that you can debug a machine that just hangs during suspend (or more commonly, during resume).

To use this debugging feature you should attempt to suspend the machine, reboot it and then run

dmesg -s 1000000 | grep 'hash matches'

CAUTION: this option will cause your machine's real-time clock to be set to an invalid time after a resume.

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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