How should I successfully hibernate Ubuntu 16.04?

I've tried almost every solution on the web but non of them was actually helpful. I found my problem almost completely similar to this one

Best Answer


Hibernation using systemctl and getting it working in tough cases

For me, pm-hibernate always fails. After some tweaks, I was able to hibernate using the interface of systemd (init system in 16.04 and above). I also managed to get it working on 17.04 with a swap file. This case study might be useful for people with problems

First try

sudo systemctl hibernate

If that fails, begin troubleshooting: in the hibernate state (htd or acpi s4) the machine state is written to disk so that no power is needed to preserve it. The state is written to either a swap partition or a swap file Note: if using Btrfs DO NOT attempt to use a swap file as this may cause filesystem corruption

Your swap partition or swap file may need to be the same size as RAM to allow hibernation, but there is a good chance you will be able to hibernate if it is at least 2/5 the size of RAM, according to the Arch wiki page , so try other steps first before increasing swap size.

If your problem is that you get a clean boot instead of the expected resume, at a minimum you most likely need to set a boot parameter to find the disk image

Find the swap partition

grep swap /etc/fstab

for me this returns (partial output)

# swap was on /dev/mmcblk0p3 during installation

where /dev/mmcblk0p3 is the partition to specify

Add a parameter boot

sudoedit /etc/default/grub

To the line starting GRUB_CMDLINE_LINUX_DEFAULT add resume=/dev/YourSwapPartition to the section in quotes (replace with the the partition you identified earlier). Using my example.

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash resume=/dev/mmcblk0p3"

Any time you change this file, you must run sudo update-grub or the changes will have no effect.

You need to reboot now You can then try to hibernate by issuing the command

sudo systemctl hibernate

When the system is started press the power button again and the system will boot

If you still have problems, start debugging.

I include my case below as an example, but detailed information on debugging S states can be found in this blog and also this one .

Set some more boot parameters to gather more information Remove quiet and splash and add initcall_debug and no_console_suspend which will cause init system calls to be printed to the console so you can watch what is going wrong. I've done it

GRUB_CMDLINE_LINUX_DEFAULT="resume=/dev/mmcblk0p3 no_console_suspend initcall_debug"

Which helped me to see what was wrong with my resume from hibernation You can also try using dmesg .

In my case, after resume I lost WiFi, and the kernel clearly was upset as most commands (for example reading anything from /sys , reloading modules or any systemctl command) would not work - the process would appear to start and just hang (all this would be returned to normal after reboot of course). Watching the system very slowly shut down and reading all the debug messages, i noticed that there were a lot of problems with "brcm", so i guessed my broadcom wireless driver module was to blame. I figured out my hibernation procedure by first unloading the module

sudo modprobe -r brcmfmac
sudo systemctl hibernate

on resume I reinsert the module

sudo modprobe brcmfmac

Everything worked perfectly I also have to blacklist the btsdio module which seems to be incompatible with brcmfmac

Update: Hibernation using a swap file on 17.04.

Once again with help from the Arch wiki page and some additional tinkering, I managed to get hibernation to work on 17.04 with a swap file. This required an additional boot parameter, resume_offset=n where n is the first number under physical_offset in the output of sudo filefrag -v /swapfile .

$ sudo filefrag -v /swapfile
Filesystem type is: ef53
File size of /swapfile is 1425873920 (348114 blocks of 4096 bytes)
 ext:     logical_offset:        physical_offset: length:   expected: flags:
   0:        0..   32767:      34816..     67583:  32768:
   1:    32768..   63487:      67584..     98303:  30720:
   ....

Therefore, the additional boot parameter in my case is resume_offset=34816 . You still need to set a boot parameter for the partition to start from This is the root partition or whatever partition your swap file is located on

GRUB_CMDLINE_LINUX_DEFAULT="no_console_suspend initcall_debug resume=/dev/mmcblk1p2 resume_offset=34816"

Where /dev/mmcblk1p2 is my root partition (yours is more likely to be something like /dev/sda2 ).

During resume I saw the image loading successfully, but in my case (just an example - YMMVAPD) then some more drivers ( i2c_designware ) threw some errors and I got a complete system freeze on resume. Hibernation works if I unload those modules in addition to brcmfmac , but the system quickly becomes unusable without those modules. So i wrote a script to unload the grumpy modules and immediately reinstate them when i resume

# remove buggy modules
modprobe -r brcmfmac i2c_designware_platform i2c_designware_core &&
# hibernate
echo disk > /sys/power/state
# reinsert
modprobe i2c_designware_core i2c_designware_platform brcmfmac

When I want to hibernate, I run sudo bash script . This works very well

TL;DR

Use systemd, set a boot parameter for resume from swap, identify buggy drivers and unload them before initiating hibernation. If the system doesn't work long without those modules or you need to unload several it may be easier to use a simple script to initiate hibernation