Bug#902416: systemd: systemctl hibernate: unable to resume after upgrade

[Joel Cross]

On Fri, 6 Jul 2018, at 5:31 PM, Michael Biebl wrote:
> Am 06.07.2018 um 17:02 schrieb Mario.Limonciello at dell.com:
> >> -----Original Message-----
> >> From: Michael Biebl [mailto:biebl at debian.org]
> 
> >> If you have multiple swap partitions and you run
> >> echo "disk" > /sys/power/state
> >> which partition does the kernel use?
> >>
> > 
> > Whichever one was configured in /sys/power/resume prior to running that command.
> > 
> > The kernel can't know which one /to/ hibernate to unless it was configured in advance.
> > Just like the initramfs can't know which one to resume /from/ unless it knew which one
> > it resumed to.
> > 
> 
> Joel, can you please tell us,
> - which partition you have configured in /etc/initramfs-tools/conf.d/resume
> - which partition you have configured in /sys/power/resume
> - the size of both swap partitions
> 

$ cat /proc/swaps
Filename				Type		Size	Used	Priority
/dev/sdb4                               partition	9752572	1473128	100
/dev/sda8                               partition	6236156	0	10

$ blkid /dev/sdb4 /dev/sda8
/dev/sdb4: LABEL="Swap" UUID="0797ee37-d1b9-49ea-a865-c73682cd96a7" TYPE="swap" PARTUUID="57f4c922-04"
/dev/sda8: UUID="84f3e7a4-c3af-4ac1-a789-cc554395a50b" TYPE="swap" PARTUUID="170bc00e-08"

$ grep resume /boot/grub/grub.cfg|head -n 1
	linux	/vmlinuz-4.16.0-2-amd64 root=UUID=033d10f2-5402-4632-bed0-5e24842cf1b7 ro  quiet splash resume=UUID=84f3e7a4-c3af-4ac1-a789-cc554395a50b

$ cat /etc/initramfs-tools/conf.d/resume
cat: /etc/initramfs-tools/conf.d/resume: No such file or directory

$ cat /sys/power/resume
8:8

>From the above (especially grub.cfg) you can see that the smaller, lower-priority partition is set as the resume partition (this was actually an oversight on my part when I installed the second drive). Do you think this could be what's preventing hibernate from working properly?

Also, do you think it is significant that the /etc/initramfs-tools/conf.d/resume file does not exist on my system?

-Joel