Shouldn't the underscan setting for a monitor be retained M1 Mac running Big Sur wakes up?
Running 202 M1 MacMini using HDMI interface to Samsung SyncMaster P2450 at default resolution (1920x1080 60Hz) Must adjust underscan for monitor to display properly which is fine. If the computer sleeps underscan setting is reset to default. This appears to be a bug in Big Sur 11.2.3.
Mac mini, macOS 11.2