HowTo: Detect Laptop waking up from suspend from Emacs

HowTo: Detect Laptop waking up from suspend from Emacs

[raman]

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

[aaermolov]

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Hi,

depending on your Linux distro you may want to install acpid package
(its name may vary), which brings your a bunch of files, presumably
in /etc/acpi, which describes ACPI events along with handlers to run on
them.

Be wary of this functionality have no direct connection with suspending
itself, AFAIK. For this you may use pm-utils/hibernate-script.

Having all this, you may want to pay attention to lid.sh under
/etc/acpi.

cheers,
Alex

raman@google.com writes:

> 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?
> -- 
>
> -- 
>
> -- 

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

[Michael Albinus]

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.

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

[raman]

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

[Michael Albinus]

raman <raman@google.com> writes:

Hi,

> Thanks for the dbus pointers -- I was hoping that someone had already
> gone down this route:-)

<https://github.com/oyvindstegard/emacs-misc/blob/master/elisp/upower.el>
seems to have it implemented. Haven't tested it.

Best regards, Michael.

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

[raman]

thanks for that pointer. I  was looking at sauren on melpa that also
implements some dbus listeners. DBus is something I never got around to
learning, guess this is my chance:-)
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Re: HowTo: Detect Laptop waking up from suspend from Emacs

[Michael Albinus]

raman <raman@google.com> writes:

> thanks for that pointer. I  was looking at sauren on melpa that also
> implements some dbus listeners. DBus is something I never got around to
> learning, guess this is my chance:-)

Good luck! Maybe, (info "dbus") is also helpful.

Ping me, if you run into trouble.

Best regards, Michael.

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

[raman]

Thanks Again!

I pulled over upower.el -- turns out it was written originally by the
same person who wrote nm.el that I was already using. I've incorporated
upower.el and nm.el into Emacspeak as a quick hack for now -- will
likely try to grow it into something more full-fledged based on what I
end up needing. But upower.el has already fixed my primary annoyance of
needing to remember to turn the backlight off after waking up from suspend.
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Re: HowTo: Detect Laptop waking up from suspend from Emacs

[T.V Raman]

After playing with dbus on the weekend, and using a combination of
dbus-monitor, gdbus, dbus-send etc to see what dbus did -- it makes me
want some kind of Emacs integration for exploring/discovering dbus
things -- perhaps a company backend for dbus? 
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Re: HowTo: Detect Laptop waking up from suspend from Emacs

[Michael Albinus]

raman@google.com (T.V Raman) writes:

> After playing with dbus on the weekend, and using a combination of
> dbus-monitor, gdbus, dbus-send etc to see what dbus did -- it makes me
> want some kind of Emacs integration for exploring/discovering dbus
> things -- perhaps a company backend for dbus? 

Have you tried the introspection functions of dbus.el?

Beside of this, I don't know whether there are so many users of D-Bus in
Emacs, that it pays to write a company backend for this. Personally, I
found the d-feet tool sufficient when exploring D-Bus objects.

Best regards, Michael.

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

[T.V Raman]

Yes, tried the introspect functions. That was when I thought
company-based completion would be nice:-)

Michael Albinus writes:
 > raman@google.com (T.V Raman) writes:
 > 
 > > After playing with dbus on the weekend, and using a combination of
 > > dbus-monitor, gdbus, dbus-send etc to see what dbus did -- it makes me
 > > want some kind of Emacs integration for exploring/discovering dbus
 > > things -- perhaps a company backend for dbus? 
 > 
 > Have you tried the introspection functions of dbus.el?
 > 
 > Beside of this, I don't know whether there are so many users of D-Bus in
 > Emacs, that it pays to write a company backend for this. Personally, I
 > found the d-feet tool sufficient when exploring D-Bus objects.
 > 
 > Best regards, Michael.

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

[Stefan Huchler]

raman@google.com writes:

> 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?
> -- 
>
> -- 

if you run the deamon you could maybe write in some external tools
somethnig like:

/usr/bin/emacsclient -e (wakeup-starter)

and then something like that in your config

(defun...
   (sit-for 5)
   ....)

You can hook that command in I dont know logind? or dbus? udev? as some
rule or maybe even systemd:

https://wiki.archlinux.org/index.php/Power_management#Suspend.2Fresume_service_files


Hope that helps you.

Alternativly you could of course do a polling thing, and start that with
emacs:

(while (t) (when (timestamp differs to much from last-time) (setq
last-time timestamp) (do-your-stuff) (sleep 5)))

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

[Tom Tromey]

>>>>> "raman" == raman  <raman@google.com> writes:

raman> I'd like to set things up so emacs runs a set of actions when the
raman> laptop comes back from suspend -- typically, say 5 seconds after
raman> wake-up. Here, all actions are emacs functions.

Note that if you're specifically interested in being notified when the
network comes back up, there is a different way to do this with dbus.
See:

https://github.com/tromey/emacs-network-manager

Tom

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

[raman]

Tom Tromey <tom@tromey.com> writes:

Looking at this now -- I was using a quick hack called nm.el that I had
discovered a few years ago on the net. Speaking of network-manager, I
have longed to get enwc to work on my Ubuntu laptop --- I have never
succeeded in using it to setup a wifi network from scratch. Looking at
your code now >>>>>> "raman" == raman  <raman@google.com> writes:
>
> raman> I'd like to set things up so emacs runs a set of actions when the
> raman> laptop comes back from suspend -- typically, say 5 seconds after
> raman> wake-up. Here, all actions are emacs functions.
>
> Note that if you're specifically interested in being notified when the
> network comes back up, there is a different way to do this with dbus.
> See:
>
> https://github.com/tromey/emacs-network-manager
>
> Tom

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