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Document Battery Optimization challenges on Android

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* etc/PROBLEMS (Runtime problems specific to Android): Mention
battery optimization, the way it impacts background execution,
and how it might be disabled.
This commit is contained in:
Po Lu 2023-11-18 17:41:51 +08:00
parent 7b7a37ec7b
commit 6aa70c236f
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etc/PROBLEMS
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@ -3567,6 +3567,27 @@ port is a large undertaking that we are looking for volunteers to
perform. If you are interested in taking responsibility for this
task, please contact <emacs-devel@gnu.org>.
** Emacs can only execute spasmodically in the background.
Recent Android releases impose "battery optimization" on programs for
which it is not expressly disabled; such optimization inhibits the
execution of background services outside brief windows of time
distributed at intervals of several dozens of minutes. Such programs
as ERC which must send "keep-alive" packets at a rate beyond that at
which these windows arrive consequently lose, yielding connection
timeouts after Emacs has been in the background long enough that
battery optimization enters into effect.
This optimization can be disabled through the Settings app: navigate
to "Apps & notifications", "Emacs", "Battery", "Battery Optimization",
before clicking the drop-down menu labeled "Not Optimized", selecting
the option "All Apps", scrolling to "Emacs", clicking on its entry and
selecting "Don't Optimize" in the dialog box thus displayed.
The organization of the Settings app might disagree with that
illustrated above, which if true you should consult the documentation
or any search mechanism for it.
* Build-time problems
** Configuration