Messages in this thread | | | Date | Thu, 27 Jun 2013 01:18:08 +0200 | From | Pavel Machek <> | Subject | Re: [PATCH v3] power: Add warning message about incorrect system date and time after resume when pm_trace is enabled |
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On Wed 2013-06-26 16:27:35, Shuah Khan wrote: > pm_trace uses the system's Real Time Clock (RTC) to save the magic number. > 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. > > 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 > or rdate to reset the correct date/time from an external time source when > using this trace option. > > There is no run-time message to warn users of the consequences of enabling > pm_trace. Adding a warning message to pm_trace_store() will serve as a > reminder to users to set the system date and time after resume. > > Signed-off-by: Shuah Khan <shuah.kh@samsung.com>
Acked-by: Pavel Machek <pavel@ucw.cz>
-- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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