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

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Date:   Wed, 25 Jul 2018 22:33:55 +0200
From:   Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
To:     Pavel Machek <pavel@....cz>
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 Pavel

On Wed, Jul 25, 2018 at 10:02 PM, Pavel Machek <pavel@....cz> wrote:
> Hi!
>
> I have two big problems with droid 4. #1 is that it lost 2 SMS.. and I
> have no idea why. Second is power consumption -- it seems to be rather

Depend how do you set the SMS buffering using CNMI if I remember. Modem
has 1024bytes of memory most of the time that can buffer more then 1 sms.
Modem rise a irq when they receive a call or sms, or you an use the serial but
omap family can loose the first char coming from the serial so you can lost the
sms because parsing fail

> 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.

Michael

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



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| Michael Nazzareno Trimarchi                     Amarula Solutions BV |
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