Putting the system to suspend to RAM locks up the system. Everything spins down (disks, fans) just to start up immediately again. The displays stay powered down. Only remedy is a hard reset.
5.14 and 5.10-LTS work. Currently I’m just curious if someone experiences the same issue.
Quick update: The issues still exists as off 5.15.7, but I discovered by accident that disabling the on-board Ethernet port in the BIOS fixes the issue. 
Encouraged I looked into some wake-on-lan related topics (even if it happens with no LAN cable connected). Afaict I also exhausted other settings in the BIOS which look even remotely connected to power-management or wake/sleep. No success so far.
If it works fine on three lts, it’s very likely a kernel issue. Please submit a bug report to them so they can fix it. There’s l very little we can do here with kernel bugs.
Unless you have a very good reason to use the latest kernel, use LTS. By the time a kernel version becomes LTS, such bugs are typically fixed.
Thanks, will eventually do. Usually I like to check the community first if it’s a “only me” problem or if there’s an easy solutions, before consuming developer-cycles with a bug report.
Also I didn’t want to leave the questing hanging after discovering a workaround. Just for people coming from search engines in the meanwhile. 
Actually LTS is few months older than the platform and I noticed some minor functionality missing (e.g. the A-RGB headers). So there was a reason - this time.
Seems to be fixed in 5.16. 
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