I have the same problem, but my suspect is different. I see:
"Sep 22 12:44:31 vorfeed gnome-power-manager: (jbj) suspend failed"
In the message every time.
Looking at the source, this can only happen in gpm-manager.c, "gpm_syslog
("suspend failed");"
The sleep_failure callback is set to handle the sleep-failure signal, which is
only emitted by gpm-control.c if hal_gpower_suspend returns false. In
libhal-gpower.c I see the dbus call and recreate it at the command line:
$ dbus-send --system --print-reply --dest=org.freedesktop.Hal
/org/freedesktop/Hal/devices/computer
org.freedesktop.Hal.Device.SystemPowerManagement.Suspend int32:0
Error org.freedesktop.Hal.Device.UnknownError: ifdown: interface ath0 not
configured
ifdown: interface eth0 not configured
So in my case, the failure is because of
/etc/acpi/suspend.d/55-down-interfaces.sh trying to work magic on interfaces
that ifup/ifdown don't think are up.
--
gpm says my computer failed to suspend even when it suspends/resumes fine
https://bugs.launchpad.net/bugs/138824
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