Laptop randomly awakes from suspend to black screen---how to troubleshoot?

[brahma]

check the stable update annoucement, there is some issue mentioned related to suspend, so you can try the proposed solution:

@philm

System freezes for 60 seconds and then wakes back up or hangs after waking up

Since systemd v256, systemd freezes user.slice before sleeping. This process can fail due to kernel bugs, particularly when KVM is in use.[13] [14]

Messages in the logs will contain Failed to freeze unit 'user.slice' before sleep. When such an issue occurs, trying to login (start another session) would fail with pam_systemd(process:session): Failed to create session: Job 9876 for unit 'session-6.scope' failed with 'frozen'.

To temporarily revert back to the old behavior, edit systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-sleep.service, and systemd-suspend-then-hibernate.service with the following drop-in:

[Service]
Environment="SYSTEMD_SLEEP_FREEZE_USER_SESSIONS=false"

– Power management/Suspend and hibernate - ArchWiki

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if it doesnt help, try a differne kernel, for example install the 6.1 and try with it…