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PM / sleep: Mention async suspend in PM_TRACE documentation

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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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Pavel Machek 2015-01-26 14:43:04 +01:00 committed by Rafael J. Wysocki
parent d78cb3680c
commit a03ff6f20c
1 changed files with 4 additions and 0 deletions
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Documentation/power/s2ram.txt
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@ -69,6 +69,10 @@ Reason for this is that the RTC is the only reliably available piece of
hardware during resume operations where a value can be set that will
survive a reboot.
pm_trace is not compatible with asynchronous suspend, so it turns
asynchronous suspend off (which may work around timing or
ordering-sensitive bugs).
Consequence is that after a resume (even if it is successful) your system
clock will have a value corresponding to the magic number instead of the
correct date/time! It is therefore advisable to use a program like ntp-date