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Old 11-10-2011, 12:02 PM   #1
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Registered: Sep 2010
Location: Germany
Distribution: Ubuntu 11.10, 12.04
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Hibernate problem using 2 swap partitions

Hi folks!

I have a debian 6.0.3 on a 2GB RAM desktop with (initially) only a 1GB swap partition.

Not surprisingly, when I used to run programs that occupied more than 1GB of my RAM, I couldn't hibernate.

Because I had an 8GB partition that I didn't use, I turned it into a second swap partition. (I formatted the partition as swap, I edited the /etc/fstab adding it and then I used swapon IIRC, it was a few months ago.)

But even after that, when I try to hibernate with over than 1GB of RAM used, I get the same error: "PM: not enough free space". Frustrating... I have some free time now to search and resolve this.

Some more info (sda5 -> my original swap, sda8 -> my 2nd swap):

% fdisk -l /dev/sda | grep sda[58]
/dev/sda5 6225 6348 995998+ 82 Linux swap/Solaris
/dev/sda8 8341 9336 8000338+ 82 Linux swap/Solaris

% cat /proc/swaps
Filename Type Size Used Priority
/dev/sda5 partition 995988 0 -1
/dev/sda8 partition 8000328 0 -2

% grep swap /etc/fstab
UUID=7d76837c-e342-48f7-a625-6799ccc548b4 none swap sw 0 2
/dev/sda8 none swap sw 0 2

% cat /etc/initramfs-tools/conf.d/resume

% blkid /dev/sda[58]
/dev/sda5: UUID="7d76837c-e342-48f7-a625-6799ccc548b4" TYPE="swap"
/dev/sda8: UUID="e3227967-2f70-4540-92c9-3e0e324fdd04" TYPE="swap"

First, I tried to stop using my initial swap partition. It's only 1GB anyway. So, I commented it out in the /etc/fstab. Then, I updated the UUID of the new partition in resume file. After a reboot, I tried to hibernate but the computer didn't do it. I got no error message as far as I understand the output (or it was too quick, or just I didn't notice). It tried to hibernate entering console mode, it did not reach the point when writing to swap file (one can see the progress in a % counter) and it came back.

No clue why this does not work.

Do I need to add one more line in the resume file with the uuid of the 2nd partition perhaps? I am not sure if this works, if it supports multiple lines, that is.

I am looking for this in the net, but I can't find any similar problem with 2 swap partitions.

Any ideas? Thanks in advance!
Old 11-10-2011, 03:01 PM   #2
Registered: Apr 2011
Location: UK
Distribution: Kubuntu 11.10
Posts: 562

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What is the output of cat /proc/swaps now?

In your grub.cfg (assuming you are using GRUB) do you have any additional parameters in the boot entries? ('linux' lines within 'menuentry' blocks)
Try adding resume=/dev/sda8 to the end - you can test this out by hitting 'e' at the grub menu.
Old 11-11-2011, 12:38 AM   #3
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Registered: Sep 2010
Location: Germany
Distribution: Ubuntu 11.10, 12.04
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SOLVED: Adding the swap partition as a resume=... parameter in /etc/default/grub

> In your grub.cfg [...] Try adding resume=/dev/sda8 to the end

Yeap! That was the missing setting. It worked.

For some strange reason -stupid of me maybe- I thought myself yesterday: "There is no resume parameter there, why should I _add_ one?" But seems if there is no parameter, the kernel may just grab the first swap partition in the disk.

Thanks a lot!!


hibernate, initramfs, problem, resume, swap

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