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CONFIG_PM_TRACE_RTC: Suspend/resume event tracing

General informations

The Linux kernel configuration item CONFIG_PM_TRACE_RTC:

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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