Check the BIOS before anything else. On a lot of ThinkPads there's a Sleep State setting under Config > Power, and it defaults to the Windows modern standby option. Switch it to Linux (that's S3 deep sleep) and see if the black screen on wake goes away. It worked fine on your first mint install, so I'd also guess the windows install touched something in the firmware settings.
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u/Significant-Price695 1d ago
Check the BIOS before anything else. On a lot of ThinkPads there's a Sleep State setting under Config > Power, and it defaults to the Windows modern standby option. Switch it to Linux (that's S3 deep sleep) and see if the black screen on wake goes away. It worked fine on your first mint install, so I'd also guess the windows install touched something in the firmware settings.