OK, I created a new script in /etc/acpi/suspend.d/95-set-image-size.sh
with the content:

#/bin/bash

echo 1048576 > /sys/power/image_size

That works fine. The script gets called by /etc/acpi/prepare.sh which in
turn is executed from within /etc/acpi/hibernate.sh. It's also run when
going into suspend to RAM mode but that doesn't hurt. I think creating a
new file is better than altering an existing one for this way it won't
be overwritten by updates.

Anyway, where is the RAM content being written on the disk? On the swap
partition? Then what if your RAM is full and the swap partition contains
data as well? Or is a file used for hibernation? Questions over
questions...

-- 
Suspend to disk fails: image_size too small
https://bugs.launchpad.net/bugs/88377
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