Lubuntu 18.04 (lxde) here, upon AMD Epyc 7282. Kernel 4.15. The system is stable and works flawlessly, but id does refuse to suspend.
If I try to suspend it, the screen blanks, but the system does not power off.
At this point, if I hit a key or move the mouse, nothing happens. If I hit the power button, the system "wakes up", presenting the login screen, and then all the applications as I left them.
Hibernation is absent alltogether.
Note that Epyc Rome is not affected by the notorious RDRAND bug which affects Ryzen 3000 and causes problems with suspend to ram.
EDIT: I used the system for days with high load, and can confirm rock stability, but if I leave it blanking the monitor, there is no way to wake it up.. One has to connect via ssh and reset the system.
EDIT(II): Example output for
journalctl -u systemd-suspend.service:
gen 25 04:33:52 epyc systemd: Starting Suspend... gen 25 04:33:52 epyc systemd-sleep: Suspending system... gen 25 04:34:36 epyc systemd-sleep: System resumed. gen 25 04:34:36 epyc systemd-sleep: /dev/sda: gen 25 04:34:36 epyc systemd-sleep: setting Advanced Power Management level to 0xfe (254) gen 25 04:34:36 epyc systemd-sleep: APM_level = 254
EDIT (III): I actually managed to hibernate the system using
uswsusp, by specifying explicitly the resume device, that is, the swap partition:
sudo s2disk -r /dev/sda1
In such condition the system does shut down visualizing
SNAPSHOTTING THE SYSTEM...
If I power on, the system does boot saying
RESUMING FROM HIBERNATION... but then, it just displays the desktop, with no trace of any application left open. I will investigate the logs and report back.