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I have two swap partitions in fstab :
/dev/sda8 none swap sw,pri=1 0 0
/dev/sdb8 none swap sw,pri=1 0 0
How to set swap in /etc/initramfs-tools/conf.d/resume file?
According to SwapFaq this will not work for 12.04:
INFO: This will not work for 12.04, resume from hibernate work differently in 12.04.
How to do it in Ubuntu 12.04?
Check UUID
sudo blkid
Then
sudo gedit /etc/default/grub
to pull up the boot loader configuration. Look for the line GRUB_CMDLINE_LINUX_DEFAULT="" and using your UUID add:
resume=UUID=41e86209-3802-424b-9a9d-d7683142dab7
That means change this
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
to this
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=UUID=41e86209-3802-424b-9a9d-d7683142dab7"
save then edit:
gksu gedit /etc/initramfs-tools/conf.d/resume
and make sure its contents are
RESUME=UUID=41e86209-3802-424b-9a9d-d7683142dab7
(with your UUID of course in place of mine). Save the file!
sudo update-grub
sudo update-initramfs -u -k all
Reboot!
https://help.ubuntu.com/community/SwapFaq
Edit: Technically only one of the two methods needs to be used, the kernel parameter in the grub file will take precedence over the initramfs resume config file
/etc/default/grub? At the message is from initramfs, changing /etc/initramfs-tools/conf.d/resume should be more than enough. You add another dependency in Grub, which will make the next change much more difficult. But thanks for pointing out the resume file + update-initramfs, that did the trick!
(18.04) You can also edit /etc/initramfs-tools/conf.d/resume and change RESUME=UUID=$uuid to the output of blkid /dev/raidN (whatever block device your 2 swap devices are RAID'd as)
