Some clues:
NVIDIA:
There is mention of hibernation under UFS in this document Jetson AGX Xavier Software Features, and also in this driver documentation Jetson Xavier NX, AGX Xavier Series, and TX2 Series Package Manifest.
OTHER INFORMATION:
Add ‘Hibernate’ Option in Power Menu in Ubuntu 18.04
How can I hibernate on Ubuntu 16.04?
Hibernate and resume from a swap file
Perhaps Nvidia engineers will find time to implement hibernation on their Jetson AGX hardware with reference to the above information, as from their documentation, it appears to be doable.
There also appears to be a hibernate package available:
Package: hibernate
Architecture: all
Version: 2.0+15+g88d54a8-1
Priority: extra
Section: universe/utils
Origin: Ubuntu
Maintainer: Ubuntu Developers ubuntu-devel-discuss@lists.ubuntu.com
Original-Maintainer: Andrey Rahmatullin wrar@wrar.name
Bugs: OpenID transaction in progress
Installed-Size: 302
Pre-Depends: dpkg (>= 1.15.7.2)
Depends: kbd
Recommends: dash, hdparm, vbetool, uswsusp
Suggests: 915resolution, xscreensaver | kscreensaver | gnome-screensaver | xlock | vlock
Filename: pool/universe/h/hibernate/hibernate_2.0+15+g88d54a8-1_all.deb
Size: 85954
MD5sum: b01e14c145ea271cac212c775f2331cf
SHA1: a4bc60e66bf92019f4a14d27e519d4cb6eb4c338
SHA256: c41b2896e9b0cb64ecad9a2b7dad8ef16dbbf25a10a35a96891db4c74b2050b9
Homepage: http://tuxonice.net/
Description-en: smartly puts your computer to sleep (suspend to RAM or disk)
The hibernate script helps you in putting your computer to sleep, using one
of the various methods available in the kernel.
.
Hibernate can take care of loading and unloading modules, provides various
hacks needed to get some video cards to resume properly under X, can
optionally restart networking and system services, and basically do whatever
else you ask it. It can be extended by writing new “scriptlets” which run at
different points during the suspend process.
.
Currently the script supports all suspend mechanisms available through the
/sys/power/state interface (including ACPI suspend and the in-kernel software
suspend), as well as TuxOnIce.
Description-md5: 56f68fb0a4a2864a3b5ccf3bd54281b3