I have installed Ubuntu on my Thinkpad x230 several years ago and it was working like magic out of the box. However with some update suspend stopped to work and I have not found a solution for quite long.

What has solved my problem was to disable some BIOS setting that was unnecessary for me anyway:

https://www.linuxquestions.org/questions/linux-laptop-and-netbook-25/how-i-solved-suspend-hibernation-and-poweroff-issues-with-my-lenovo-x230-4175673862/

I want to rant how many different solutions you can find online to solve suspend problem that do not work:

• Updating kernel to older or newer version. This actually sometimes help, but you never know if you are going to be lucky one.

• Play around with /etc/default/grub (e.g.: https://forums.debian.net/viewtopic.php?f=7&t=150008)

• Play around with /etc/default/acpi-support. I have this file changed on my machine and I believe it does nothing.

• Play around with /etc/systemd/logind.conf

• Using airplane mode before suspend.

• Disabling USB 3.0 in BIOS or some other random suggestions what to do in your BIOS. (e.g. https://bbs.archlinux.org/viewtopic.php?id=238928)

• Playing around with variuos logging tools and etc (e.g. https://wiki.ubuntu.com/DebuggingKernelSuspend)

It is year 2022 and Linux still manages break suspend that works and gives no easy tools to find out how to solve your problem. I suspect there is some opportunity in here…