It appears that the P14s AMD does support S3. Comment from @chx on a different thread I found last week: You can check which ThinkPad BIOS has the option at t

It appears that the P14s AMD does support S3. Comment from @chx on a different thread I found last week: You can check which ThinkPad BIOS has the option at their BIOS emulation site: https://download.lenovo.com/bsco/index.html https://download.lenovo.com/bsco/index.html For mine it's under Config // Power // Sleep State. Windows 10 means useless Modern Standby, Linux means S3. https://i.imgur.com/Y5CchL9.png https://i.imgur.com/Y5CchL9.png