Thinkpad P14s AMD 2nd gen: suspend to RAM doesn't work

I own the new Thinkpad P14s AMD 2nd gen with Ubuntu 21.04 and full disk encryption. It almost works out of the box except for Wi-Fi (that can be fixed with this driver) and suspension.

Actually, I'm not totally sure where the problem is: if I try to suspend, all keyboard lights switch off, except for the power button that stays on. When I try to resume from suspension, keyboard lights switch on but the screen doesn't and I can do nothing except forcing the shut down by holding the power button.

Can the problem be related to full-disk encryption? Or maybe some kernel problem with this new laptop?

Solution 1:

I fixed the issue, which wasn't related to disk encryption: this laptop has the S0 sleep mode activated by default, but Linux supports S3 (suspend to RAM).

To fix it, from BIOS → Energy switch the sleep mode from Windows (S0) to Linux (S3) and suspension to RAM starts working!