My laptop has
# cat /sys/power/state freeze mem
and indeed I can suspend as root:
echo -n mem > /sys/power/state
This works fine. But what would be a minimalist way to enable user (non-root) to suspend ?
I am using Debian Buster, but I don't have
systemd installed (I am using old style sysvinit). And I don't have udev daemon running either (I am using the "kernel space" udev).
I would like to achieve user suspend capability with minimal additional packages required.
On earlier Debian version (Wheezy), I could install:
and then issue a command via dbus. I think it was something like this:
dbus-send --system --print-reply --dest="org.freedesktop.UPower" /org/freedesktop/UPower org.freedesktop.UPower.Suspend
this no longer works. Now I have read that
upower has changed and the curent verison in Debian
0.99.10 is not supposed to work. but I installed
upower from wheezy (
0.9.17), just to test it, but that does not work either. The
dbus-send command gives me this error:
Error org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 127
dbus might not be the simplest setup anyway. What is actually the purpose of
upower? Those utilities only work for root. But as root, I already can suspend with
echo -n mem > /sys/power/state. What do those utilities bring extra?
I see pm-utils installs lots of various scripts. What else do I need to handle besides issuing
echo -n mem > /sys/power/state ?
And how could I achieve all that as user ?
Perhaps writing a simple
C program that writes
/sys/power/state, and set the
s bit same as for instance
Would this be a workable and clean solution? Or would this be considered a "dirty" solution? Are there better solutions?
What else do I need to handle, besides writing
Do I need to
ifup the network ?