Based on this: http://forums.linuxmint.com/viewtopi...f=191&t=104875 it looks like the system may be resuming from suspend, but the screen is turned off.
Can you try this script to see if it helps?
1. Create the hook:
2. Copy/Paste the following content:
sudo leafpad /etc/pm/sleep.d/00blank_screen_fix
3. Save the file and make it executable:
case "$1" in
vbetool dpms off
vbetool dpms on
*) exit $NA
sudo chmod +x /etc/pm/sleep.d/00blank_screen_fix