Comment 140 for bug 1566302

I had the same problem and I solved this way, a work around:

am not sure but I think in that case swap memory should be equal to your ram size or more, I resized to to 8gb which is equal to my ram.

open terminal and do the following:

sudo gedit /etc/default/grub

replace the line

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash'"

With

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor acpi_osi='!Windows 2013' acpi_osi='!Windows 2012'"

save and close then also in terminal

uncomment the line #HandleLidSwitch and make sure value equal suspend (or hibernate,depend on wha you want) to look like this

HandleLidSwitch=suspend

you have to restart fully twice , then try.

in case it didnt work out try uninstall acpi-support y typing
sudo apt-get remove acpi

I found the first step of the solution from this guy
https://www.youtube.com/watch?v=l8xa-PkDhhk

now both hibernate and suspend works !!