linux-kernel - Re: A desktop environment[1] kernel wishlist

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Date:	Wed, 06 May 2015 14:41:38 +0200
From:	Bastien Nocera <hadess@...ess.net>
To:	Chirantan Ekbote <chirantan@...omium.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	John Stultz <john.stultz@...aro.org>,
	Olof Johansson <olof@...om.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	snanda@...omium.org, Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: A desktop environment[1] kernel wishlist

On Tue, 2015-05-05 at 12:22 -0700, Chirantan Ekbote wrote:
> On Tue, May 5, 2015 at 3:46 AM, Bastien Nocera <hadess@...ess.net> 
> wrote:
> > 
> > >   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
> suspend.

File https://bugzilla.freedesktop.org/show_bug.cgi?id=90339

Cheers

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