I have an XPS 9500 and have found this infuriating. I think there's two separate things going on: As others have noted, S3 sleep isn't supported, only S1 "sleep to idle" sleep. But I don't think this is the direct cause of the overheating. In S1 sleep, the laptop can average something like 900mW of power usage, which is enough to annoyingly knock a few percent off your battery overnight, but not enough to make the la…
I have an XPS 9500 under Linux (this is a >$4000 machine), no amount of fiddling with BIOS settings (which are few) or systemd/GNOME settings will make it work reliably: - short suspend time (it can't really stay overnight when suspended with a full battery) - sometimes it wakes up and overheats in the bag - very short battery duration when unplugged Apparently I'm not alone, and even under Windows it's a generalized…
https://www.kernel.org/doc/html/latest/admin-guide/pm/sleep-...
And if you want to dig into what happening in s2idle, https://01.org/blogs/qwang59/2018/how-achieve-s0ix-states-li...