Same problem on HP compaq 6730b running Ubuntu 12.10 64bit. Pressing power button and select Suspend from the menu does not suspend. Suspend from the cog (gear) menu works fine.
Error message shows up in both .xsession-errors and syslog. gnome-session[2736]: libupower-glib-CRITICAL: up_client_get_can_suspend: assertion `UP_IS_CLIENT (client)' failed Nov 16 16:54:00 ghar-iqbala gnome-session[2736]: libupower-glib- CRITICAL: up_client_get_can_suspend: assertion `UP_IS_CLIENT (client)' failed iqbala@ghar-iqbala:~$ lsb_release -a LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch Distributor ID: Ubuntu Description: Ubuntu 12.10 Release: 12.10 Codename: quantal iqbala@ghar-iqbala:~$ sudo apt-cache policy gnome-session [sudo] password for iqbala: gnome-session: Installed: 3.6.0-0ubuntu1 Candidate: 3.6.0-0ubuntu1 Version table: *** 3.6.0-0ubuntu1 0 500 http://us.archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages 100 /var/lib/dpkg/status iqbala@ghar-iqbala:~$ -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-session in Ubuntu. https://bugs.launchpad.net/bugs/1041137 Title: Activating suspend from power button menu does not work To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-session/+bug/1041137/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs