Hi Ranjan,

I have done all of those steps. Created big enough swapfile. Added the resume flag. Updated grub.cfg. Disabled the secure boot. It still doesn't work.

I have wasted 24 hours of my life on this stupid thing. I am now reinstalling with a dedicated swap partition.

This is very unfortunate that things don't work on systems that are shipped with Linux preinstalled (Precision 5510 came with Ubuntu 14.04).

For resume_offset see the kernel docs linked below.

https://www.kernel.org/doc/Documentation/power/swsusp-and-swap-files.txt

---- On Mon, 02 Jan 2017 20:10:44 +0530 Ranjan Maitra <maitra@email.com> wrote ----

Sudhir,

What exactly did you try? Here are my notes (that work for me on all but one laptops):

## To get hibernate going (since F20):

sudo vi /etc/defaults/grub

## add --> resume=UUID="****" <-- to the line GRUB_CMDLINE_LINUX= (anywhere, i do it before the rhgb which I also take out since I like to see what is happening

## where the uuid is obtained using

sudo blkid.

## then

sudo bash -x grub2-mkconfig
sudo bash -x grub2-mkconfig -o /boot/grub2/grub.cfg

Reboot and things work for me on about half a dozen machines, all Dells of varied vintage (including one XPS13) and one Thinkpad T510.

I am not aware of the resume_offset flag: where did you get this?

Ranjan

PS: The one laptop where it did not work is a Dell Precision M3800 where it is not reliable. There was a long-standing bug in kernel which was fixed in 4.8 but with this machine, hibernate reliably worked on 4.8.4 but the unreliability (not always coming back, especially if a number of windows were left open) returned post-4.8.5,

Many thanks again$
Ranjan

On Mon, 02 Jan 2017 15:33:38 +0530 Sudhir Khanger <sudhir@sudhirkhanger.com> wrote:

> Hi back,
>
>
>
> After a lot of Google search it seems to hibernate using swap file I need both the resume flag and resume_offset flag. After setting these my system seems to go into hibernation but doesn't recover. It just boots into a new session. Also systemctl hybrid-sleep is working as far as I can tell.
>
>
>
> ---- On Mon, 02 Jan 2017 11:52:16 +0530 Sudhir Khanger <sudhir@sudhirkhanger.com> wrote ----
>
>
>
>
> Hi,
>
>
>
> I am setting up a new Dell Precision 5510. It has 16gb of RAM. I chose to create a swapfile of 24gb (1.5 times is recommended by RHEL 7 docs).
>
>
>
> The swap is on, resume flag has been set in /etc/default/grub, and secure boot if off. That's my understanding of the common bug entry.
>
>
>
> When I hibernate my system it simply locks the system. No hibernation is done. I gave Kubuntu a try to see if there is a problem with hibernation and it works fine on Kubuntu.
>
>
>
> If you guys have any ideas I would really appreciate it.
>
>
>
> Regards,
>
> Sudhir Khanger,
>
> sudhirkhanger.com.
>
>
>
>
>
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> To unsubscribe send an email to users-leave@lists.fedoraproject.org
>
>
>
>
>
> Regards,
>
> Sudhir Khanger,
>
> sudhirkhanger.com.
>
>
>
>
>

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Regards,

Sudhir Khanger,

sudhirkhanger.com.