Hiberation doesn't work in Precise (worked in Oneiric) on Dell XPS 13

[Jared Dominguez]

Hiberation doesn't work in Precise (worked in Oneiric) on my Dell XPS 13. I can add the following to /etc/polkit-1/localauthority.conf.d/51-ubuntu-admin.conf to get back the hibernate option:
     [Configuration]
     AdminIdentities=unix-group:sudo;unix-group:admin

However, if I hibernate, starting the machine just does a normal boot and does not restore the previous state. The swap is large enough for hibernation:
        danjared@spyder:~$ cat /proc/swaps
        Filename Type Size Used Priority
        /dev/zram0 partition 1966796 0 100
        /dev/sda5 partition 4077564 0 -1
        danjared@spyder:~$ free
                     total used free shared buffers cached
        Mem: 3933596 1004176 2929420 0 44304 449540
        -/+ buffers/cache: 510332 3423264
        Swap: 6044360 0 6044360

I am happy to help with debugging or testing.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pm-utils 1.4.1-9
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Tue Mar 13 21:15:06 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)

[Ben Prescott (ben.prescott)]

I'm investigating this on my HP Mini netbook.
The fix in /etc/polkit is already present on my precise build, still no hibernate option.

One apparent gap in the build is a kernel command line argument to indicate where to find the hibernate image.

I've got this now; the 'resume' argument, but I can't initiate hibernate (via the GUI) so can't test it -

$ cat /proc/cmdline
BOOT_IMAGE=/vmlinuz-3.2.0-20-generic-pae root=/dev/mapper/valiantvg-lv00sys00 ro resume=/dev/sda2 quiet splash vt.handoff=7

based on docs here, this is required

https://wiki.archlinux.org/index.php/Pm-utils#Hibernation_.28suspend2disk.29

added it by amending

/etc/default/grub as follows ..

GRUB_CMDLINE_LINUX_DEFAULT="resume=/dev/sda2 quiet splash"

and then running sudo update-grub

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Ben Prescott (ben.prescott)]

Suspect we're both suffering from Bug #812394

[Jared Dominguez (jared-dominguez)]

It turns out that the answer was right in front of me (well, after some research). Something had added a zram swap device. Because of there being two swap devices, the kernel wasn't properly able to hibernate. I removed the zram swap device, and now I am able to hibernate properly.

[Jared Dominguez (jared-dominguez)]

I should add that perhaps there should be a check for this sort of situation to notify the user.