Waking up from sleep often results in blank screen, forceful shutdown

[brahma]

maybe this will help, from the stable update annoucement:

@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