When I put ThinkPad to sleep, the fans are still spinning...how to turn off like PC?

Do you not have the ‘Hibernate’ option present?

Do you have the resume parameter present?

cat /proc/cmdline

No. What resume parameter?

Show the output of the command I gave.

BOOT_IMAGE=/boot/vmlinuz-6.10.3-1-default root=UUID=8c706080-98c8-42f1-a945-842bc62822d8 splash=silent quiet security=apparmor mitigations=auto

It is prohibited when Secure Boot is active.

Secure Boot is disabled.

You’ll need to create a swap partition if you want to proceed with trying it:

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