To get it to show "hibernate after" in advanced power settings / sleep, have a look at: [URL] Option 1 didn't work for me running windows 11. However option 2 (changing registry) added the entry to "hibernate after".
Out of curiosity, is there no advanced power options (sleep) for the 9510?  I did a clean install of Windows 11 and loaded all of the drivers.  No issues in Device Manager.  I made sure that "Hibernate" is enabled and can manually hibernate using the power button.  However, there is no hibernate setting under Power Options>Change Plan Settings>Change Advanced Power Settings>Sleep. I would like to be able to set Sleep to Hibernate as it uses less battery/power.  Is this normal or do I need to install or change a setting somewhere?  I've also noticed that the only Power Plan is "Balanced"  None of the usual "High Performance" or "Power Saving" plans are available.  Thanks.
Dell XPS 15 9510 Hibernate?