I saw this thread : Prevent external monitors from shutting off when laptop lid is closed? I entered this code (from that thread): gconftool-2 --type string --set ...
Just upgraded from 11.04 to 11.10. Power management worked fine in natty, now on lid close it just blanks screen but does not put the computer to sleep. Interestingly, sometimes even does not blank ...
Since I installed 11.10 the system does not suspend when I close the lid. In Power Management, the values for both battery and plug are set to suspend. When I just click on suspend, it works fine.