We introduce a module in charge to display and toggle on click the
power profiles via power-profiles-daemon.
https://gitlab.freedesktop.org/upower/power-profiles-daemon
This daemon is pretty widespread. It's the component used by Gnome and
KDE to manage the power profiles. The power management daemon is a
pretty important software component for laptops and other
battery-powered devices.
We're using the daemon DBus interface to:
- Fetch the available power profiles.
- Track the active power profile.
- Change the active power profile.
The original author recently gave up maintenance on the project. The
Upower group took over the maintenance burden… …and created a new
DBus name for the project. The old name is still advertised for now.
We use the old name for compatibility sake: most distributions did not
release 0.20, which introduces this new DBus name. We'll likely revisit
this in the future and point to the new bus name. See the inline
comment for more details.
Given how widespread this daemon is, I activated the module in the
default configuration.
We already use it without checking (`<gio/gdesktopappinfo.h>` in
wlr/taskbar), it's a transitive dependency of GTK and it's always
available on Unix platforms.
The `<experimental/filesystem>` and `-lc++experimental` aren't needed
since LLVM 9.0. And since we now require C++20, checking for the
`<filesystem>` support shouldn't be necessary either.
The module provides the three system load averages. This is an
improvement compared what you can do with the cpu module: cpu
only provides the one minute sample and the state of the cpu module is
derived from the cpu usage which messes up the formating of the load
average. Also, at least on modern Linux systems, the load of a system
takes much more than the cpu utilization into account and it should
therefore live in a separate module.
Viktar Lukashonak