linux-kernel - Re: Attempted summary of suspend-blockers LKML thread

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Message-ID: <20100804074628.4acc0ed2@schatten.dmk.lab>
Date:	Wed, 4 Aug 2010 07:46:28 +0200
From:	Florian Mickler <florian@...kler.org>
To:	david@...g.hm
Cc:	Arve Hjønnevåg <arve@...roid.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	"Ted Ts'o" <tytso@....edu>, linux-pm@...ts.linux-foundation.org,
	linux-kernel <linux-kernel@...r.kernel.org>, mjg59@...f.ucam.org,
	pavel@....cz, rjw@...k.pl, stern@...land.harvard.edu,
	swetland@...gle.com, peterz@...radead.org, tglx@...utronix.de,
	alan@...rguk.ukuu.org.uk
Subject: Re: Attempted summary of suspend-blockers LKML thread

Hi,

On Tue, 3 Aug 2010 21:47:49 -0700 (PDT)
david@...g.hm wrote:

> > Suspend is not an android only concept. The android extensions just
> > allow us to aggressively use suspend without loosing (or delaying)
> > wakeup events. On the hardware that we shipped we can enter the same
> > power mode from idle as we do in suspend, but we still use suspend
> > primarily because it stops the monotonic clock and all the timers that
> > use it. Changing suspend to behave more like an idle mode, which seems
> > to be what you are suggesting, would not buy us anything.
> 
> Ok, If I am understanding you correctly I think this is an important 
> point.
> 
> What Android calls suspend is not what other linux distros call suspend, 
> it's just a low-power mode with different wakeup rules.
> 
> Is this correct?

I think my laptop (x86-64) uses the same notion of suspend as Android.
I am confused now. Android 'suspend' is equivalent to 
'echo "mem" > /sys/power/state' 
 
Which distros call it "low-power mode with different wakeup rules"?
Gentoo doesnt. In KDE/Gnome it's also called suspend or suspend-to-ram
iirc. 



Cheers,
Flo






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