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

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Message-ID: <CAMuHMdWw+rX-r2uVN0ZL-GFirOkCn7+Gh7BVd3JvyXXS_pcdVw@mail.gmail.com>
Date:	Tue, 21 Oct 2014 20:24:31 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Bastien Nocera <hadess@...ess.net>
Cc:	John Stultz <john.stultz@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: A desktop environment[1] kernel wishlist

On Tue, Oct 21, 2014 at 7:14 PM, Bastien Nocera <hadess@...ess.net> wrote:
>> As for: 'Export of "wake reason" when the system wakes up (rtc alarm,
>> lid open, etc.) and wakealarm (/sys/class/rtc/foo/wakealarm)
>> documentation'
>>
>> Can you expand more on the rational for the need here? Is this for UI
>> for power debugging, or something else?
>
> No, it would be used for automating backups, or implementing
> suspend->hibernation transitions. For example, right before the machine
> suspends, I would schedule it to wake up in a hour. If I get woken up by
> the rtc alarm (and not by the user through a lid open), I might:
> - check that I'm plugged into the AC, it's night, and in the vicinity of
> the server that handles my backups and so backup the system.
> - check whether the battery is low, and hibernate the machine (if it
> supports it, obviously).

Isn't this already available through /sys/kernel/debug/wakeup_sources
and/or the various power/wake* files in sysfs?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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