How to suspend with a keyboard shortcut?

Question

I would like to suspend my xubuntu (14.04) system from a keyboard shortcut without entering my superuser password (sudo). I'm looking a command line which I can convert to a shortcut.

So far, I tried two solutions:

Xfce command:

xfce4-session-logout --suspend

Problem: The system doesn't lock the session. I don't need to enter my password for the wake-up and I want to do it.

Dbus:

dbus-send --print-reply --system --dest=org.freedesktop.UPower /org/freedesktop/UPower org.freedesktop.UPower.Suspend

Problem: After wake-up, the Internet connection is down and I have to reboot the system to get it back.

Is there a third solution which 1. ask the password during the wake-up process, and 2. doesn't mess up with Internet connection?

In fact, the graphical default shortcut (from the menu) works fine. I just don't know which command line is called.

Answer 1

I wrote a script. It seems to do what you ask for:

#!/usr/bin/env zsh
# Custom suspend
#
# (That 'zsh' up there can be switched to 'bash', or 
# pretty much any shell - this doesn't do anything too fancy.)
#
# Dependencies are mostly xfce stuff:
#
#   xbacklight
#   xflock4
#   xfce4-session-logout

# Set how dim we want the screen to go (percentage, out of 100)
dim=5

# Pack up your toys
previous_dimness=$(xbacklight -get)

# Turn down the lights
xbacklight -set $dim

# Lock the door (this requires a password to get back in)
xflock4

# And go to sleep
xfce4-session-logout --suspend

# When we wake up, turn the lights back on
xbacklight -set $previous_dimness

Answer 2

You can very simply send the command for it to lock screen first, and then have it suspend:

xscreensaver-command -lock ; xfce4-session-logout --suspend

For usage of xscreensaver-command, run xscreensaver-command --help

Answer 3

Oddly enough xfce4-session-logout --suspend works just fine, and my system is xubuntu 14.04. It also does lock the session, although I have switched on the option "lock screen before sleep", go to Settings->Session and Startup-> Advanced, and check if it switched on there.

Answer 4

This command works for me: I just make a launcher for desktop and set the Shutdown Icon for that. put this command in command filed:

dbus-send --print-reply --system --dest=org.freedesktop.UPower /org/freedesktop/UPower org.freedesktop.UPower.Suspend

fist time ask me to make Executable and after that working very well.

I'm using wicd for Internet connection and It's working well too after waking up!