Slackware 13.37 hibernation

Slackware doesn't provide a out of the box configuration to hibernate even though stock kernel is capable.

Few modifications to your lilo configuration could enable hibernation.

To do so edit your /etc/lilo.conf with the following, assuming that your are using the default configuration from slackware.

image = /boot/vmlinuz
root = /dev/sda1
label = Slackware(Res)  
#for resuming /dev/sda6 is the my swap
append = "resume=/dev/sda6" 
read-only

After saving the file re-run lilo to apply the changes.