The C3000 will suspend when I press the on/off key, suspend from the menu, or the apm --suspend command, but it will not suspend when I close the lid. I believe I started having this issue after...
# cd /home/root
# ln -s /usr/local usr
...as per instructions on installing Perl. I'm not sure though. Uninstalling keyhelper did not change this. Also, the LCD does turn off when I close the lid.