Ubuntu 22.04 not waking up after second suspend

Question

After the first suspend it wakes up just fine - it's the second suspend after which the screen stays blank and keyboard doesn't react (although the power LED starts glowing). It happens if I close the laptop's lid or do a manual suspend via the system menu.

I have a recent Thinkpad T14s with a Ryzen CPU, Ubuntu 22.04 is the only OS (if that's important).

What I tried:

• turn off security chip in the BIOS (https://askubuntu.com/a/1412049/424896)
• turn off Wayland and enable X11 (https://askubuntu.com/a/1412032/424896)
• I looked through the logs in /var/log but couldn't find anything obvious to me (but I'm not a Linux guru).

Anyone has an idea what might help here?

Answer 1

I stumbled over this Reddit post. There is a "Sleep State" switch in the BIOS of some Thinkpads (including mine): Config ➜ Power ➜ Sleep State ➜ "Linux" / "Windows 10". I just turned it from "Windows" to "Linux" and it works now.