The S3 deep sleep mode is not available on the XPS 13 9310. This is by design. When using a Dell Ubuntu image, the battery discharge issue was resolved with kernel update to 5.8. However, there will be some amount of battery discharge due to the Connected / Modern Standby feature. If there are any issues with battery draining with the Dell Ubuntu image, reply to the private messages sent to you by the DELL-Cares agent on your unique case number with the Service Tag, issue, etc.
My computer drains a lot of battery when in sleep mode. I've tried following the steps outlined in this bug report, tried the diagnosis layed out in this question and disabled the "sign of life" options in the BIOS as described here. I confirmed my system sleeps in the `s2idle` state. Which I suspect is the problem. However I have 2 issues when trying to follow the above guides: Firstly my `/sys/power/mem_sleep` file does not contain a `deep` option: And secondly I can't seem to edit the file to add a `deep` option: Not being able to close the lid and have the laptop suspend is very annoying. Any help on this would be greatly appreciated. OS: Ubuntu 20.04, 5.8.0-26-generic / Hardware: Dell XPS 13 9310
XPS 13 9310, Ubuntu, deep sleep missing