Bug 90339

Summary: RFE: logind should try to avoid suspend races
Product: systemd Reporter: Bastien Nocera <bugzilla>
Component: generalAssignee: systemd-bugs
Status: NEW --- QA Contact: systemd-bugs
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: Other   
OS: All   
i915 platform: i915 features:

Description Bastien Nocera 2015-05-06 12:41:09 UTC
From http://article.gmane.org/gmane.linux.kernel/1945822 :

>>   The last thing the power manager does, right before
>> writing "mem" to /sys/power/state, is write the wakeup_count that it
>> read earlier to /sys/power/wakeup_count.  If the write fails, the
>> power manager considers the suspend attempt failed, reads the new
>> wakeup_count, and starts a timer (usually 10 seconds) to retry the
>> suspend.  The same thing happens if the write to /sys/power/state
>> fails.
> Is this something that logind should do as well?

We do it to avoid a race condition where a wakeup event occurs after
userspace has started the suspend process but before anything writes
"mem" to /sys/power/state.  I'm guessing that this is something logind
should be doing as well since the chances of missing a wakeup event
increase the longer any given delay inhibitor takes to delay a

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