It will hibernate if I manually select that option from the power menu, but it will not go into hibernation on its own (even though I have it set to do so after 15 minutes). Also, I don't know if this is related, but I am no longer able to adjust the screen brightness. The laptop is a Lenovo Ideapad 3. I started running into problems like this after I put in a new hard drive but I fail to see what the connection is.