PM / sleep: Mention async suspend in PM_TRACE documentation
Document pm_tracing actually affecting suspend in non-trivial way. Signed-off-by: Pavel Machek <pavel@ucw.cz> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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@ -69,6 +69,10 @@ Reason for this is that the RTC is the only reliably available piece of
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hardware during resume operations where a value can be set that will
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survive a reboot.
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pm_trace is not compatible with asynchronous suspend, so it turns
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asynchronous suspend off (which may work around timing or
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ordering-sensitive bugs).
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Consequence is that after a resume (even if it is successful) your system
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clock will have a value corresponding to the magic number instead of the
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correct date/time! It is therefore advisable to use a program like ntp-date
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