I upgraded to 11.04 on the day for its release and I am unable to hibernate my laptop, When I click on Hibernate, the screen just goes blank and cursor starts blinking in the top left corner and nothing happens. . It used to work fine till 10.10. Suspend/Resume works fine though. I am using 11.04 64bit on Dell Inspiron N5010 it have ATI graphics card and I am using propriety drivers for it installed via jockey. Thanks
Ok I have solved this problem. The solution is to use tuxonice patched kernel. Its very simple, just follow these steps.
sudo add-apt-repository ppa:tuxonice/ppa sudo apt-get update sudo apt-get install tuxonice-userui linux-generic-tuxonice linux-headers-generic-tuxonice
Restart your system. Thats it.
Ubuntu has a better method documented to enable hibernation. If this doesn't work, probably you don't have enough space in your swap drive to hibernate.