linux-kernel - Re: Droid 4: suspend to RAM?

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Message-ID: <20180727113214.GA32069@amd>
Date:   Fri, 27 Jul 2018 13:32:15 +0200
From:   Pavel Machek <pavel@....cz>
To:     Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>,
        Sebastian Reichel <sre@...nel.org>, nekit1000@...il.com,
        mpartap@....net, Merlijn Wajer <merlijn@...zup.org>
Subject: Re: Droid 4: suspend to RAM?

Hi!
> > > high even before modem (and thus USB) is enabled.
> > >
> > > Interestingly, CyanogenMod and Jolla seem to have higher power
> > > consumption than stock operating system.
> > >
> > > (My Linux can survive for 10 hours, stock system could survive for 4
> > > days if I'm not mistaken).
> > >
> > > I thought I would experiment with suspend to RAM.. and it indeed
> > > seemed to suspend ok, but I could not wake it up. Do I need to set up
> > > wakeup with button somehow? Is suspend to RAM required for good power
> > > consumption?
> > 
> > Sorry but pm subsystem has debug mode that you can test in a easy way.
> > You can even wakeup by any rtc alarm easily.
> 
> Yes, that is how it works on PC (but there power button works,
> too). Is it expected to work on Droid in v4.18?

I tried setting up wakeup using RTC, but no, it does not seem to work:

root@...uan:/my/tui/d4# rtcwake -m no -s 5
rtcwake: wakeup using /dev/rtc0 at Fri Jul 27 11:28:44 2018
root@...uan:/my/tui/d4# echo mem > /sys/power/state

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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