I am running:

Ubuntu 9.3.0-17ubuntu1~20.04
Linux version 5.4.0-52
AMD Ryzen 9 3900X
ASUS X570 Prime Pro

When I attempt to suspend my machine about 75% of the time it locks up before entering suspend. The CPU fan continues to run and the power light is full on but nothing is shown on the display. Pressing the power button or keyboard has no effect, only long pressing the power button to power off can exit this state.

Are other people experiencing this suspend problem? Is there any chance a new kernel version will fix this issue or are there any suggested workarounds?

I am running the latest BIOS available Version 2802 from 2020/10/23.

I was also having intermittent lockups while running normally, I use the follow boot options to resolve this trouble: processor.max_cstate=5 rcu_nocbs=0-11

Does hibernate work?

I haven't tried hibernate, but considering I've got 64GB of RAM it seems like it would consume non-trivial time so I'd prefer to just suspend. I also had to disable the ACPI feature in my BIOS to prevent lockup issues as well. Overall it seems linux kernel 5.4 is very unstable on AMD Ryzen processors without a lot of tweaking. I decided to go ahead and update to Ubuntu 20.10 which uses linux kernel 5.8 to see if that works.

As well as ACPI, there's systemd, and a 'Power Manager' in your DE to deal with. Disabling ACPI is not always wise as that links with the BIOS pretty well, and looks after things like CPU cooling.

As you aren't providing half the infdormation required to offer help with this issue, I can't advise you beyond going at those parts yourself.

I've determined the problem is this: https://bugzilla.kernel.org/show_bug.cgi?id=210241

So the problem has nothing to do with ryzen but instead that I am using a recent kernel with Magic Trackpad 2. If I do not attach the Magic Trackpad 2 to my desktop suspend and resume works fine.

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