Comment 7 for bug 1008650

After a reboot I retested, the behaviour was similar except that instead of the dialgoue box, the system shutdown.

I then killed the daemon and did the following:

kenneth@kennetheeepc:~$ xfce4-power-manager --no-daemon --debug
TRACE[xfpm-main.c:203] xfpm_start(): Starting the power manager

(xfce4-power-manager:1967): GLib-WARNING **: (/build/buildd/glib2.0-2.32.1/./glib/gerror.c:390):g_error_new_valist: runtime check failed: (domain != 0)

(xfce4-power-manager:1967): xfce4-power-manager-WARNING **: Unable to connect to session managet : Failed to connect to the session manager: SESSION_MANAGER environment variable not defined
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for general-notification
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for lock-screen-suspend-hibernate
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for power-save-on-battery
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for enable-cpu-freq-control
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for critical-power-level
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for show-brightness-popup
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for change-brightness-on-key-events
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for show-tray-icon
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for lid-action-on-ac
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for brightness-level-on-ac
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for brightness-level-on-battery
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for dpms-enabled
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for dpms-on-ac-sleep
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for dpms-on-ac-off
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for dpms-on-battery-sleep
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for dpms-on-battery-off
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for dpms-sleep-mode
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for inactivity-on-ac
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for inactivity-sleep-mode
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for brightness-on-battery
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for spin-down-on-ac
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for spin-down-on-ac-timeout
TRACE[xfpm-xfconf.c:156] xfpm_xfconf_load(): Using default configuration for spin-down-on-battery-timeout
TRACE[xfpm-power.c:1055] xfpm_power_get_power_devices(): Power device detected at : /org/freedesktop/UPower/devices/line_power_AC0
TRACE[xfpm-power.c:1002] xfpm_power_add_device(): device added: ((XfpmDeviceType) XFPM_DEVICE_TYPE_LINE_POWER)
TRACE[xfpm-power.c:1055] xfpm_power_get_power_devices(): Power device detected at : /org/freedesktop/UPower/devices/battery_BAT0
TRACE[xfpm-power.c:1002] xfpm_power_add_device(): device added: ((XfpmDeviceType) XFPM_DEVICE_TYPE_BATTERY)
TRACE[xfpm-power.c:1013] xfpm_power_add_device(): Battery device detected at : /org/freedesktop/UPower/devices/battery_BAT0: ((XfpmDeviceType) XFPM_DEVICE_TYPE_BATTERY)
TRACE[xfpm-button.c:179] xfpm_button_xevent_key(): Grabbed key 124 : ((XfpmButtonKey) BUTTON_POWER_OFF)

(xfce4-power-manager:1967): xfce4-power-manager-WARNING **: could not map keysym 1008ffa8 to keycode

TRACE[xfpm-button.c:179] xfpm_button_xevent_key(): Grabbed key 213 : ((XfpmButtonKey) BUTTON_HIBERNATE)
TRACE[xfpm-button.c:179] xfpm_button_xevent_key(): Grabbed key 150 : ((XfpmButtonKey) BUTTON_SLEEP)
TRACE[xfpm-button.c:179] xfpm_button_xevent_key(): Grabbed key 233 : ((XfpmButtonKey) BUTTON_MON_BRIGHTNESS_UP)
TRACE[xfpm-button.c:179] xfpm_button_xevent_key(): Grabbed key 232 : ((XfpmButtonKey) BUTTON_MON_BRIGHTNESS_DOWN)
TRACE[xfpm-button.c:179] xfpm_button_xevent_key(): Grabbed key 244 : ((XfpmButtonKey) BUTTON_BATTERY)
TRACE[xfpm-battery.c:148] xfpm_battery_refresh_visible(): visible=TRUE: ((XfpmShowIcon) SHOW_ICON_WHEN_BATTERY_PRESENT)
TRACE[xfpm-battery.c:284] xfpm_battery_refresh_icon(): Battery state 4
TRACE[xfpm-power.c:1149] xfpm_power_refresh_adaptor_visible(): Tray icon configuration: : ((XfpmShowIcon) SHOW_ICON_WHEN_BATTERY_PRESENT)
TRACE[xfpm-power.c:1113] xfpm_power_hide_adapter_icon(): Hide adaptor icon
TRACE[xfpm-polkit.c:369] xfpm_polkit_init_data(): Using unix session polkit subject
TRACE[xfpm-polkit.c:456] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.upower.suspend is authorized=TRUE
TRACE[xfpm-polkit.c:456] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.upower.hibernate is authorized=FALSE
TRACE[xfpm-power.c:1149] xfpm_power_refresh_adaptor_visible(): Tray icon configuration: : ((XfpmShowIcon) SHOW_ICON_WHEN_BATTERY_PRESENT)
TRACE[xfpm-power.c:1113] xfpm_power_hide_adapter_icon(): Hide adaptor icon
TRACE[xfpm-polkit.c:456] xfpm_polkit_check_auth_intern(): Action=org.freedesktop.udisks.drive-set-spindown is authorized=TRUE
TRACE[xfpm-disks.c:170] xfpm_disks_get_is_auth_to_spin(): Is auth to spin down disks : 1
TRACE[xfpm-disks.c:147] xfpm_disks_set_spin_timeouts(): On Battery=0 spin_down_enabled=0 timeout=800

TRACE[xfpm-backlight.c:324] xfpm_backlight_brightness_on_ac_settings_changed(): Alarm on ac timeout changed 9
TRACE[xfpm-backlight.c:345] xfpm_backlight_brightness_on_battery_settings_changed(): Alarm on battery timeout changed 120
TRACE[xfpm-dpms.c:74] xfpm_dpms_set_timeouts(): Settings dpms: standby=600 suspend=0 off=900

TRACE[xfpm-button.c:114] xfpm_button_filter_x_events(): Key press: ((XfpmButtonKey) BUTTON_POWER_OFF)
TRACE[xfpm-manager.c:259] xfpm_manager_button_pressed_cb(): Received button press event: ((XfpmButtonKey) BUTTON_POWER_OFF)
TRACE[xfpm-manager.c:287] xfpm_manager_button_pressed_cb(): Shutdown request : : ((XfpmShutdownRequest) XFPM_ASK)
TRACE[xfpm-polkit.c:239] xfpm_polkit_free_data(): Destroying Polkit data

At this point the system did not shutdown, despite what the TRACE said.