Fresh install of LUbuntu 16.04 on a Compaq CQ58 (El cheapo AMD C60 laptop from Wal*Mart, bought on Black Friday 2012.)
I walk away from it and it's supposed to suspend.
I come back to an authentication screen requesting my password before it's allowed to suspend. There's also a message in the upper corner saying, "Power Manager: GDBus.Error:org.freedesktop.DBus.Error.NoReply: Method call timed out."
Requiring authentication to suspend defeats the purpose.
Manually suspending by the taskbar button does not require authentication.