https://askubuntu.com/questions/248967/laptop-screen-stays-blank-after-lid-is-reopened/1098390#1098390

  • INFO: This will not work for 12.04, resume from hibernate work differently in 12.04.’

Pull up a Terminal again and run

cat /proc/swaps

and hopefully you see the path to your swap partition listed there. If not chances are something went wrong in the steps above. Here’s my output:

Filename Type Size Used Priority
/dev/dm-1 partition 2676732 73380 -1

Then Find the uuid of the device

$ cd /dev/disk/by-uuid
$ ll
total 0
drwxr-xr-x 2 root root 160 Feb 13 23:17 ./
drwxr-xr-x 8 root root 160 Feb 13 23:17 ../
lrwxrwxrwx 1 root root  10 Feb 13 23:17 06af334d-676b-4b46-88ec-30105b980e1d -> ../../dm-1

gksu gedit /etc/default/grub

& to pull up the boot loader configuration. Look for the line

GRUB_CMDLINE_LINUX=""

and make sure it looks like this (using your UUID of course).

GRUB_CMDLINE_LINUX="resume=UUID=06af334d-676b-4b46-88ec-30105b980e1d"

and save the file

sudo update-grub

and wait for it to finish

gksu gedit /etc/initramfs-tools/conf.d/resume

& and make sure its contents are

resume=UUID=06af334d-676b-4b46-88ec-30105b980e1d

(with your UUID of course in place of mine). Save the file!

sudo update-initramfs -u

Reboot!