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.
so cat /sys/power/mem_sleep or whatever outputs with the brackets on deep?
Yeah, if the bracket is on deep, it crashes and enter the BIOS recovery thingy. If it’s s2idle, it does what it says on the tin.