Re: HowTo: Detect Laptop waking up from suspend from Emacs

[raman <raman@google.com>]

Michael Albinus <michael.albinus@gmx.de> writes:

Thanks for the dbus pointers -- I was hoping that someone had already
gone down this route:-)> raman@google.com writes:
>
> Hi,
>
>> Background:
>>
>> I run Emacs as my primary environment -- ie I do everything in Emacs
>> on Linux.
>>
>> So when I open my laptop lid, my laptop wakes up from suspend and
>> Emacs is where I left off.
>>
>> I'd like to set things up so emacs runs a set of actions when the
>> laptop comes back from suspend -- typically, say 5 seconds after
>> wake-up. Here, all actions are emacs functions.
>>
>> So Q:
>>
>> From Emacs --- perhaps an idle-timer, how do I detect when the laptop
>> returns from suspend?
>
> The D-Bus system bus offers the org.freedesktop.UPower.Wakeups interface
> (provided, your GNU/Linux system runs the upowerd daemon). Maybe you
> could register for the DataChanged signal. I've never tried it myself,
> 'tho.
>
> Another possibility could be the D-Bus system bus org.freedesktop.login1
> interface. Signal PrepareForSleep seems to be emitted in both cases, the
> system goes to sleep (argument true), or the system wakes up from sleep
> (argument false). You could register for this signal. Again, I've never
> tried it myself.
>
> Best regards, Michael.

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