I just upgraded my Asus 1015E from 12.04 to 13.04, then to 13.10. From Gnome Flashback (no effects), if I select "Suspend" or close the lid, the computer does not go into low power mode, instead acting like I hit the "lock screen" button. I'd like to avoid having to turn the computer off every time I need to shut the lid.
I had the same problem with my 1015E after upgrading from 12.04 to 12.10 to 13.04 to 13.10. The forums said it was a bad idea, that I should do a clean install, but I bullishly pressed ahead anyway.
I had that problem and several others, so I wound up doing a clean install from a USB stick and now suspend works well.
The first go-round I did an encrypted home folder, this time I didn't. I am not sure if that has anything to do with it.