[CentOS] Centos 7 Not coming back from Sleep

Hi All


im running centos 7 on my HP Probook 450. the problem im having is that 
when i put the Laptop to sleep (close the lid or press power button 
once)  it goes to sleep fine. but to resume back, it cannot. it only 
lights up the keybord LED's to indicate PC is awake, but the screen will 
be blank. i have  to force reboot ( long press of power button) for the  
laptop to come back up.

what/were can i check to make sure it comes back from sleep nicely.