I have the same problem with 2 different desktop computers. The following error message appears in /var/log/syslog after an unsuccessful attempt to suspend from the gdm login screen:
"... gdm[6792]: WARNING: Request for configuration key daemon/SuspendCommand=, but not type STRING"
The SuspendCommand setting in /etc/gdm/gdm.conf looks OK to me.
The Shutdown option on the gdm login screen works fine.
I have the same problem with 2 different desktop computers. The following error message appears in /var/log/syslog after an unsuccessful attempt to suspend from the gdm login screen:
"... gdm[6792]: WARNING: Request for configuration key daemon/ SuspendCommand= , but not type STRING"
The SuspendCommand setting in /etc/gdm/gdm.conf looks OK to me.
The Shutdown option on the gdm login screen works fine.