I was running KDE Neon on ThinkBook 15 G2 and had deep sleep working after adding mem_sleep_default=deep to GRUB_CMDLINE. It worked for a while until it didn’t. I didn’t do anything other than running regulat updates. Since couple weeks back, when going to sleep, it shows BIOS Recovery progress bar or something and restarts.
I switched to Debian and the behavior is the same. S2 sleep is next to useless as it drains something like 10% battery / hour, and the lap top is warm to touch.
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This talk introduces sleepgraph, a tool that might help you debug your s2ram issues.
The talk may also convince you that, for your specific hardware, s2idle might be better than s2ram:
You still had deep sleep until now? Lucky you. To me Dell forbided S3 way earlier.
So… Bios update broke deep sleep, because fuck you, that’s why?
Is deep sleep the same thing as hibernation? Hibernation is broken for me even on new EndeavourOS install on two different laptops.